408 hyd roller, too much spring pressure?

gzig,
Do not know of any formula or scale. But Comp Cams listed their popular BHs & what they suited. There was a list of 6 or 8, but the list has grown as more people realise the benefits & start using them.
Couple of examples:
26986 description: 650 lift, sol or hyd FT. 123# seat, 280# rate.
26915: 600 lift, hyd rol cams, 105#seat, 313# rate.

Comp now has single & dual conical springs which offer the same benefits as BHs with more lift. PAC & PSI also make these springs.