Just think of all the quilts that have been in use for decades, washed with all kinds of methods including the old wringer machines ( and probably even washboards in some cases). You are just used to the high number of stitches per inch; even 10-12 stiches per inch on your machine will hold up as long as the tension is correct. Just keep working with the lower number of stitches per inch; you will quickly get used to it. (Your eyes will cheer; I can't even think about ripping out your early work without getting a head ache and crossed eyes)
Joyce in Delaware