I assume that R2s ability penalty is NOT offset by Chewies ability, right? Since you aren't DRAWING a card?

That is correct. Chewy effects cards as they are drawn. Cards like R2D2 Crew and Saboteur an Rexler can then flip them face up and you are thus impacted by the crit.

Great, thanks, and just noticed there is a rule section... Sorry for not posting there!