Thanks for the quick reply I was beginning to suspect this. Hopefully its rectified in a future update.
Meanwhile, I've been experimenting. The closest correlation that I can get is if I use just the swing percentage slider in the inspector. The default swing setting seems to (sort of) sync up with drummer swing's 50 to 60 values. In this scenario, drummer 50 = midi 0%, 51 = 10%, 52 = 20%, etc... Hopefully this helps someone in a pinch, at least until Apple are able to integrate the two more seamlessly.
Thanks.