I guess this pretty much falls under noob questions, so bear with me.
A little background-
I've been doing olympic lifts (and by olympic lifts I really just mean cleans)in my training for a little while, not in conjunction with any set olympic lifting goals. The resistance end of my training right now is really just geared towards "get big and strong" without killing me for my other training (I'm a rower) but I plan on competing sometime, either in the off season or whenever I can enter a comp without totally embarassing myself.
Current best clean is 105, just learning the snatch but I'll take a wild guess and call it 70ish.
Now the question-
A: For a guy with 2-maybe 3- days a week to O lift, would you recommend I stick to clean and snatch, or incorporate pulls, hang/power variations...etc. At my current level is it worth it?
B: More of a general programming question, but what would be the rationale behind selecting X assistance exercise for a lift? Ex: Why would a lifter select a hang snatch instead of a power snatch, or power hang, or pulls, etc? Is it based on a periodized approach or addressing weak points in a lift?
Hope that made sense, thanks.