hi herman,
to reduce paging load u need more paging channel. so first of all find out the cells having combined sdcch means sd is on BCCH.
make it to non combined made. keep the sdcch on 2nd timeslot.
by that way u can get more control channel block in a 51 multiframe. also please share the parameter setting mfr and agbl in ur network, so that we will work out on this