Going from my experiences with a 4/4 and hill climbing, nothing like enough of an increase.
Official pressure at the front of a 72 4/4 is 18 or 19 (can't remember which). That's not enough and I run 22 on the road. Competition, depends a bit on the air temperature, but 28 is the minimum and slightly more than 30 is the maximum.
On a similar basis I'd have thought 30 to 36 for a modern trike would be more like it - let's see what MMC say.
