410 LA small block will not rev past 6000

ugh?

So I went from the Hughes 3844AL (hydraulic flat tappet) cam to a CompCams custom grind based on their XR292HR grind. Mine is using 112 LSA with +4 advance baked-in (290/300 advertised, 240/248 @0.050", .584/.580 lift on 108 CL).

CompCaps retrofit hydraulic roller lifters, running pretty tight (as in 1/2 turn on 20 TPI rocker arm adjuster, so that gives about 0.025" preload). Mind you this is a stroker W2 build, but that motor just pulls and pulls, in fact I got a nasty surprise the first time I had it out b/c it wound up so fast I pulled past 6500 RPM before I realized I was already there and the big tach light went off!!! (no rev limiter since this is just a street build)

Sooo...nope, haven't see that lack of RPM to be the case with my hydraulic roller build, but perhaps the beehive springs along with geometery correction kit make that possible?
What does the geometery kit consist of?