I use the Racor 120 also with my 2gm20f on my Jeanneau. I personally can not see using a bigger filter! As others have said, I think there is another issue, ie junk in the tank, bad fuel that last fill up etc. Those are the usual reasons for clogging fuel filters with diesels, be it in my pickup, dumptruck, trackhoe, bobcat or sailboat!
She drives me boat,
I drives me dinghy!