30 ticks at 96 ppqn is just shy of a third of a quarter note in duration. An eighth would be 48 ticks, and a 16th would be 24, so there's race condition there.
I would think that using a very short pan change interval would be harmless with soft synths. The only issue I can think of is is with external hardware synths - It's possible that some really old equipment might have a fixed limit as to how fast it can pan.