We tried on both my mate's BTT4 and my P5xlt with two separate 2096 so it's unlikely a faulty 2096 I think .
He retuned his BTT4 when he changed the can (going from 9901 to 2096) he had to lean quite a bit.
I didn't change much my tuning going from 2096 to the 9901 the top end was ok but it's true the LSN (?) was a tad too lean you could almost hear the engine bog but only at the end of the long straight when closing totally the throttle at full rpm. Wasn't sure to touch the lsn or hsn and as it was just a lend I didn't wan't to upset my original settings, maybe I should've been braver.

One thing I discovered yesterday is that I'm the only one with a 13t bell... everybody has a 14t on their car. It could help as the surface is very slippery (1/2" very thin dust on hard pack almost like flour).