Those sound like some pretty good props you're running! What brand/model are they? I'm running a 15x15 PowerTech that seems to work pretty well, but I'm always looking for something better!
FYI - your link to the BRP site has an extra http// in the address; it works if you remove that. That aluminum boat might be similar weight but it has a little more beam than your 23, so that would make it plane a little easier if all other variables were the same. Deadrise is the big variable that I wasn't able to find any info on.
One neat feature of the E-Tec's is the incredible mileage they get (better than any 4-stroke) when running at hull speed, where they're in the lean burn mode. If you ever run short of fuel and are worried about range, all you have to do is slow down to hull speed to get a huge increase in range! That's a significant safety factor if you ever get caught out in really rough conditions where you have to drop off plane! I know that's hard to imagine in a SeaCraft, but every boat has it's limits!
