Hughes "retro fit" lifter not pumping up!

i'm pretty sure these lifters are manufactured by Morel.
i got a set of these and a custom grind cam from Hughes for my 360/410 stroker. one of a pair of lifters was .020" larger on the od and would not go into the bore. contacted them be email and they sent a replacement right out. next problem was they were noisy. have tried more preload, less preload and everything in between but still noisy. am pulling them out and going back to solid FT.