Group Training & Intensity (Specifically Masters Swim)

How do you all fit group workouts into your training schedule? Even with the best of intentions, every time I go to a masters swim, it ends up being a workout for me and I'd like to be able to go 3 times a week for the comradery, accountability and especially coaching. I've already seeded myself into the slowest lane but that doesn't help a ton because I'm a slow swimmer compared to most of the group (~2:00/100 at z2).