408 hyd roller, too much spring pressure?

I’d do the exact opposite. Set them just off the retainer clip at first. Like 1/4 turn passed zero lash. But they may like 1/2-3/4 turn best. At least that’s my experience.

To clarify: I have them about one turn from zero preload. I haven't tried the other version, to almost bottom the adjustment out. I guess it can make them quieter (?). On the other hand it also makes an eventual "pump up" higher...