the history of this motor is a long history and I really don't want to bother with too much telling. Important to say that I'm not addressing responsability to any builder , since I have performed myself all the works on this engine, and of course I have maximun respect of Comp's as they sell thousands of parts and I assume they know their job very well.
All I can say is that before istalling the HE275XL with spring 924, I had another Comp's cam of thump series (the 279) with valve spring 911 and I didnt experienced any problem with lifters bleeding.
Honestly I wanted a bit more power so I decided for the cam swap , since I had the 275XL unopened package at home from many years.
Now I'm taking some days to read and try to figure out what to do, thanks for help