5S gearing in a Savage Flux

[Ascender]

OK, I've heard every gearing theory on the MMM/2200kv that there is, so I'm actually looking for the info straight from the horse's mouth here. The horse, of course, being Pdelcast.

I'm currently running a stock Flux trans, 44T spur, 29/9 diffs, and Proline MT Mulchers that are taped down to keep them from ballooning. I was running a SMC 4S 6000mah 28C setup and the fan hardly ever came on, so I figure I hit the right combo.

Now I'm going to 5S, with Hyperion 2S/3s 5000MAH 35/65c batteries. I've been told variously to gear up or gear down, and everything from a 13T to 23T pinion.

Not wanting to release the CC genie, I ask you, what do you think is the right pinion for 5S?