Gamma Burst build, etc

So, I am only level 34 still on first playthoughand have spent all my points except for 2 into the Master tree. I don’t have a lot of good gear but I did get a radiation shrieking devil and using it with my red suit works okay. It seems as if I won’t have enough points to get the Megavore capstone (is it fixed?). Is a viable strategy, at least while leveling, to use the crit skills to try and keep Gamma Burst up as often as possible or would respecing into the red tree for Megavore be more efficient? Should I stick with the blue tree and put remaining available points into the red tree?Thanks for any insight.

For leveling it doesn’t matter either way. Either would be fine.