What would you do?
 

I'm currently running a htt 64/65/12. Should I keep this turbo or go with a silver 62? 62/74/14 I'm wondering because my egts get pretty warm at wot.

how much lag can you deal with. the 74 will have a much bigger top end kick and a much slower spool up time

Drive pressure has to be horrible on the 64/65 as closely matched as the compressor and turbine wheels are.