While Flaperons are a bad idea, spoilerons are an even worse idea. The purpose of a spoiler on a wing is to kill any lift the wing produces (not slow the plane down). Glider pilots use spoilers to kill the lift on the wing when the are trying to spot land their gliders in a target circle. When you deploy a spoiler it disrupts the flow of air over the top of the wing so that the wing can no longer produce any lift. If you deploy a spoiler, or spoileron, at a slow speed on approach for landing you are going to stall the plane in a position where you have no room or speed to reestablish lift on the wing and start flying again, which is going cause a crash.

The problem you are having being "floaty" and "slippy" is nothing more than you need to learn how to slow the plane down, but trust me in that this plane will slow down and fly at a reasonably slow speed. Just like anything else in flying, you need to learn how to do it and learn to be comfortable doing it. The best advice I can give you is to fly the plane at a couple of mistakes high and practice slowing the plane down until you find the stall speed of the plane, and then practice flying slowly without stalling it.

Hope this helps

Ken</p>