I have been lifting weights for around a year now and my first program I followed was starting strength. Since then I have moved onto greyskull and my training week typically looks like this:
Squat 2x5, 1x5+ A Bench B Press 2x5, 1x5+ A Tris B Bis 2x10-15 Optional Plugin
A Press B Bench 2x5, 1x5+ A Bis B Tri 2x10-15 Deadlift 1x5+ (power cleans as warmups) Optional Plugin
A Bench B Press 2x5, 1x5+ A Tri B Bis 2x10-15 Squat 2x5, 1x5+ Optional Plugin
During this time I've make considerable 'noobie' gains, and haven't really had any bad plateaus until now. For the last 3 months I have been stuck at 85KG bench and can't seem to shake it. During this time my press, squat and deadlift have all continued to slowly grow.
I eat big and am constantly (slowly) adding weight. My sleeping patterns are normal and I get enough sleep for recovery. I am fairly certain my form is good - flat head positioning, slightly arched back, planted feet and shoulders, 45-60 degree grip and arm angle to body, elbows coming into body. Bar goes straight up and down.
So my question is, what is the best thing I can add in to assist my bench - this can be either in terms of exercises or tips to remember during the lift. Is there a way to determine which body part is slowing me down the most? (Other than the obvious ones)