I didn't test many values, just copied the ones from MacBookPro6,2 which is the model I use, and changed the last value in Threshold_Low to avoid mouse lag.
I see you copied thresholds from a MacPro, I would copy from a MacBookPro instead.
Check the legacy I use, it's attached to this post http://Olarila.com/forum/viewtopic.php?f=3&t=629