Can definitely identify with the hard starting on one of our 372XPs (X-torq). Sometimes when it's cold out, it's a bear to start (enough to break a sweat!). Another odd issue that crops up with that one is that if it's idling on its side (even for a few seconds), it will often just cut out. We just joke about it being a child safety shut off, or kid the fellow who likes to leave saws idling for an hour while running the chipper!I know they had the hard starting and bad crank bearing issues. But I have never heard a lack of power in the cut from the NE XT 372.
I have yet to be into a NE 372 X-torq and have rebuilt several OE 372 and have access to a bunch to compare to.