Tabs are mainly to balance loads side to side but they can also be used to get the boat on plane quicker by putting them all the way down. Then as the boat gets up, raise them and only adjust if load dictates. Using the engine trim will adjust the boat's running angle for sure, but the SC's, particularly the 23s, run fairly flat under way to utilize the VDH so you're not going to get whole lot of upward running angle. If you really want to see what she'll do at WOT, trim the engine out until the prop starts to ventilate/break free, then you'll know when you've gone too far.
