1500 is a HUGE battery for a mini. I top out at 850mah and as light as possible. My SE5 has still ended up in pieces even with minimal weight.
You can use a single 3,7g servo with torque rods for the ailerons, my SE5 has two 1,5g micro servos on the ailerons. They work but possibly are not big enough, as you can’t turn entirely on them, most of my turning is still on the rudder.
Most of the minis still fly better as 3channel, especially the multi wings. You want super light construction, small motors and batteries. That makes for great flying. If you want more build something bigger!