MOZA R9 Rig

Hi! I bought the r9 v3 and it's currently on the way. As a first time racer, will 9nm be sufficient? I've already gone through the roof to buy the r9, is that extra 3nm of headroom in the future really worth it with the r12? I'm very casual and not very strong. Secondly, can the r9 handle the cs v2p? I've heard it's a very heavy rim.

Pairing with sr-ps.