REX: In NM 2 the MS listen to PCH while is in transfer mode with a established TBF
I think you are talking about NM 3
The third way to improve PSR is to reduce the LA size (the first two are the ones that MIke mentioned)
RF also has some influence in PSR so you need to diferenciate if your problem are pages/seg or RF problems (that includes ping pong between 2g and 3g)