I've had excellent results with MACO 820 in 120 size. I use the sunny 16 rule with an EI of 4 with either a R72 or 87 filter. I develop in Diafine and get 6x6 and 6x7 negatives that print to 16x20 with acceptable grain and decent shadow detail (for IR Film).(posted 8221 days ago)There is no IF effect with the visible light filters such as an A25 dark red. I recently got an 3x3 87 gel filter for $12 from B&H and fit it to a 77mm UV filter. Works great and a lot less expensive than a glass one ($200+). I also have found that I can load 120 in the shade with no fogging.
Be sure to presoak the film for 1-2 minutes to remove the anti- halation backing before developing.