I think the problem may be on DSO side.
My above image (last post) gives different scale than that given by astrometry net:
Center (RA, Dec):(97.999, 4.952)
Center (RA, hms):06h 31m 59.795s
Center (Dec, dms):+04° 57' 08.411"
Size:1.72 x 1.27 deg
Radius:1.070 deg
Pixel scale:1.65 arcsec/pixel
1.65 arcsec/pix would appear to me to be the correct scale!