408 hyd roller, too much spring pressure?

Cheers mate. Do you mind my asking cam, rocker ratio and rpm specs? Just curious. A bit of real-world data always helps.
Yeah mate, cam is from Howards - 258°@0.020" / 230°@0.050", 0.556" lift after lash on 110LSA.
PRW 1.6 ratio rockers, motor isn't in the car & running yet (not a lot of spare time to work on cars these days) but will probably will only see around 6000RPM.
Just to clarify these aren't Trickflow heads - they are Aeroflow castings - I bought them bare and did some bowl work and minor clean up of the ports, valve job was redone on a Newen CNC and assembled with Ferrea valves and the Lunati spring kit. All up cost me less than a set of ootb Edelbrock heads.