Could be a couple reasons,
1. Lifters could have been made to bleed down to reduce the cam duration at idle to allow engine to idle alittle better, as in a Rhoades lifter.
2. Low oil pressure at idle, too thin of oil, worn pump, weak pressure relief spring.
3. Or, too much bleed down from lifters themselves, made wrong, too much clearance inside the outer body, etc.
Call Ultradyne and ask them about the problem at hand. Have all the surrounding circumstances at hand, engine cold, engine hot, at idle, at cruise rpm, etc.
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