Solid rollers not getting enough
oil to the roller itself has always been a chronic problem. There simply not recommended for a 'street' application. I also lost a roller lifter within a few thousand miles due to lack of lubrication. The rollers go 'flat' when they stop 'rolling'.
NEWER style solid rollers are designed to take advantage of
oil pressure being directed to the roller itself, rather than rely on
oil splash. Not all blocks can use the new modern style solid rollers, which are QUITE EXPENSIVE compared to the older style. Generally it's just easier\cheaper to go with hydraulic rollers, but original 'side oiler' blocks accept ONLY solid lifters.
I went with a solid flat tappet cam when replacing my solid roller. More than adequate performance, long life and inexpensive.