You need the tool to get them synced. The eye ball trick can get them close enough but not perfect (If your slides are even a sixteenth of an inch off from one another then that can throw off your throttle response). I know the stock pipes are usually the first thing to go on a banshee. If they are as restrictive as everyone says then they could be slowing air flow and creating a rich mixture and making you bog down. Also, 2strokes don't have much of a low end.
I have 28's and started with a 160 main and a 48 pilot, now at 155 main and 45 pilot at sea level , running t5 pipes.
All the jetting topics I have read with 28's have aftermarket pipes, so i'm not really sure what your jetting should be. Hope some of this helps!