Just to update:
I ended up using the lash caps on the exhaust side only . I ground enough off the bottoms to have .005 clearence between cap and keepers. I now have things set up using same size push rod for all . If I had not used the lash caps I would have had to use a 7.5 or longer push rod on the exh side and using a longer pushrod I feared rocker stud shearing off as rocker travel was right there against it. this was with Trick Flow TW 170cc heads and Miller rockers with hyd flat lifters.