I know a local roundy round engine builder that builds a lot of SCCA spec motors that require very specific cam grinds, compression ratio, heads, manifold and carbs and so on. He ended up using solid lifters on a hydraulic lifter camshaft with right at .0010 to .0030 clearances hot to help one of his customer when the west coast tile several years in a row
My message in maybe using a solid roller lifter with a straight outer body on your build with .0010 to .0020 hot clearances may be a good solution for you also
I may have a set of slightly used Crower Ultra lifters(straight sides) in stock also, let me know if your interested in them or not