I dont want to insist on this thread too much, I received a lot of hints and I appreciate it, really.

So the decision I'm going to take is to order a new set of lifters of higher quality or let's say more engineered for hi lift cams.

From Summit catalog online I'd buy a set among these ones:

COMP Cams Pro Magnum Hydraulic Lifters 867-16 $97.97
Crower Camsaver Hydraulic Lifters 66031X3-16- $109.97
Crane Anti-Pump Up Hydraulic Lifters 99278-16-$101.60

I know there are other engine parts involved in this issue so i do not pretend that anyone without seeing the motor can give the right solution but..thank you in advance for any advise about which set would be more desiderable in theory for a cam XE275HL with 924-16 valve springs.