How do I MatLab from changing RowsPerStrip (tagID 278) upon opening Tiff?

I actually have a few questions but the main one is as posed in the title.

Situation:

I use ImageJ 1.50b to manipulate multiple single-page 32-bit gray-scale Tiffs and save the results as a single multi-page binary (8-bit gray-scale with 0 and 255; not bi-level) Tiff. The saved Tiff has the following values in each IFD (as verified using 'imfinfo' and a third-party non-MatLab Tiff tag reader). The format is "TagName (Count DataType): Value".

SubFileType (1 Long): Zero
ImageWidth (1 Long): 1300
ImageLength (1 Long): 1300
BitsPerSample (1 Short): 8
Photometric (1 Short): MinIsWhite
ImageDescription (70 ASCII): ImageJ=1.50b images=203 slices=203 unit=cm sp...
StripOffsets (1 Long): 1738610
SamplesPerPixel (1 Short): 1
RowsPerStrip (1 Short): 1300
StripByteCounts (1 Long): 1690000
XResolution (1 Rational): 4545.4545450697
YResolution (1 Rational): 4545.4545450697
ResolutionUnit (1 Short): Centimeter

The first IFD has two unrecognized tags which I assume are part of ImageJ's unusual format which supports Tiffs larger than 4 GB (even though my image is only 328 MB). I am using MatLab 2015a and get the following.

>> image=Tiff('myimage.tif', 'r+');
Warning: TIFF library warning - 'TIFFReadDirectory:  Unknown field with tag 50838 (0xc696)
encountered.' 
Warning: TIFF library warning - 'TIFFReadDirectory:  Unknown field with tag 50839 (0xc697)
encountered.' 

>> info=imfinfo('myimage.tif');
>> info(1)

ans = 

                       Filename: 'myimage.tif'
                    FileModDate: '23-Mar-2016 19:15:00'
                       FileSize: 343151334
                         Format: 'tif'
                  FormatVersion: []
                          Width: 1300
                         Height: 1300
                       BitDepth: 8
                      ColorType: 'grayscale'
                FormatSignature: [77 77 0 42]
                      ByteOrder: 'big-endian'
                 NewSubFileType: 0
                  BitsPerSample: 8
                    Compression: 'Uncompressed'
      PhotometricInterpretation: 'WhiteIsZero'
                   StripOffsets: 48610
                SamplesPerPixel: 1
                   RowsPerStrip: 1300
                StripByteCounts: 1690000
                    XResolution: 4.5455e+03
                    YResolution: 4.5455e+03
                 ResolutionUnit: 'Centimeter'
                       Colormap: []
            PlanarConfiguration: 'Chunky'
                      TileWidth: []
                     TileLength: []
                    TileOffsets: []
                 TileByteCounts: []
                    Orientation: 1
                      FillOrder: 1
               GrayResponseUnit: 0.0100
                 MaxSampleValue: 255
                 MinSampleValue: 0
                   Thresholding: 1
                         Offset: 8
               ImageDescription: 'ImageJ=1.50b
  images=203
  slices=203
  unit=cm
  spacing=2.2E-4
  loop=false
  '
                    UnknownTags: [2x1 struct]

>> image.getTag(Tiff.TagID.RowsPerStrip)

ans =

       6

>> image.getTag(Tiff.TagID.StripByteCounts)

ans =

    Columns 1 through 4

                   7800                 7800                 7800                 7800

    Columns 5 through 8

                   7800                 7800                 7800                 7800

...shortened to keep this post short...

    Columns 213 through 216

                   7800                 7800                 7800                 7800

    Column 217

                   5200

>>

If I modify a tag using 'setTag(image, id, value)' and then close the Tiff using 'close(image)', it will save the changes, including the change to the 'RowsPerStrip' and 'StripByteCounts' tags. I have tried to manually reset the tags and get the following.

>> setTag(image, Tiff.TagID.RowsPerStrip, 1300);
>> setTag(image, Tiff.TagID.StripByteCounts, 1690000);
Error using tifflib
Tag number (279) is unrecognized by the TIFF library.

Error in Tiff/setTag (line 1397)
                    tifflib('setField',obj.FileID,varargin{:});

>>

Questions:

1. How do I prevent MatLab from changing the 'RowsPerStrip' and 'StripByteCounts' tags? If I cannot, how can I reset the values?
2. From the MatLab documentation for 'setTag', "Note: If you are modifying a tag rather than creating it, you must use the Tiff.rewriteDirectory method after using the Tiff.setTag method." If this is the case, why are the changes saved when I close the image even though I don't use 'rewriteDirectory'?