Scotty,
The Glide 17 is one of the most stable boards available. The rail might dunk a little, but the long rail and volume just pushes straight back up... Self righting !

The track in a straight line really well, and move a step back or just jump on the rudder, and they actually turn around amazingly fast for a board of that size.
What are you weighing in at, at the moment?
Yes, the 17 is more stable than both of those 14's. The 14 Jav is actually one of the least stable boards!! The soft rails give it a tippy feel... But again, there is good volume, and when you dunk enough volume it just pushes back up.
Early models of the Naish 14 Glide are getting quite cheap, once they have some cosmetic blemishes. This is becoming a great board for the 2nd hand price.