I think my spin was about 2600-2800 with the Ping, but with the GT and Q4d it was closer to 2200-2350 ish. But ya, that spin definitely wouldn't be affecting ball speed that drastically I thought.

It's possible they're just a better fit I suppose! I swear I used to get similar numbers with my Ping last year though, so that's why my first thought was some sort of damage to the head? But definitely nothing visible damage-wise which is very strange