Solid roller cams HV oil pumps?

When I ran a thicker oil (15W40) thru my HV, it blew the oil filter off the pad (no 90* adapter). This happened during a rally-cross event. The oil hit the header and blue smoke covered the track.
I took the plate off and drilled 2 more holes and enlarged them All. I secured the old style plate retainer with one that had a bigger hole, and drilled that out too. installed 10W30
Round two same as the first. but less severe.
I procured a second plate, drilled it to match the first.
Round three almost cured.
Installed 5W30; problem solved.
On the next scheduled freshening, I made some internal changes to the oiling system (Leaks,lol), and was then able to go back to 10W30, but NOT 10W40
Happy HotRodding.

EDIT; Sorry, just noticed I'm in the BB forum; My experience, obviously, is with the SBM.