Are you sure the sound isn't coming from the bellhousing via the throwout bearing end of the clutch fork? This is likely the origin of the heat relation.
If the length or geometry of that after market clutch fork you're using is different, it could cause the throwout bearing to bind and grind on the shaft.
It's very unlikely that that sound is coming from the pocket end of the fork, there shouldn't be enough room or lack of pressure to allow for that noise.
I know what I'm proposing isn't good news but it's the only thing that seems to fit what you're describing. Use your stethoscope for confirmation.
After market parts suck...
Frank
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 Poncho Huggen, Gear Snatchen, Posi Piro.  
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