Although I took Gmat years ago but I remember that GMAT will evaluate your correct rate, time spent on each, and give you questions accordingly. If you cannot get the high-score question (hard questions) very quickly, you probably get a low score. Is this rule changed?
If not, they your strategy - to give up two reading might not work.
Is it true? Cause one XDF Gmat teacher gave me this advance.
But as I know, the most important questions are the former 20 questions from the 1st. So I think that giving up the latter 2 RC will not have more influence about the final score.