Spring Pressures. Solid roller lifter on a hyd roller cam.

I've been kicking around the idea of switching to solid roller lifters on my hydraulic cam in my 03 5.9 block (408).
Got the IMM 2.02 heads with beehive springs. Cam is a custom CompCam with 236/248 duration and 571/584 lift with 112LSA..blower cam. Not sure if I would need to change the springs for higher pressure ones upon using solid lifters. From my understanding I would need to.... but wouldn't be exactly sure what spring pressure I would need.

Sometimes think I hear a little rattle of the hydro lifter upon start up. Has adjustable rockers on it. Tightened up the preload a little but still does it.

The Hughes retro roller lifters has been working good in my LA 360. Good oil pressure and no ticking. However at first I had a lifter not pumping up in which after taking the lifter apart the manufacture forgot machine around a small hole inside the lifter.

Hughes "retro fit" lifter not pumping up!