If your flying that giles the UCD .60 will be a snap for you, A friend has the Phoenix Sukhoi with a OS 52 4-stroke and his needs more power too, I am planning on getting the giles too for my YS 62FZ but that can be a bit pricey but I have read that the saito 72 is also a good match if you want to try a 4-stroke if you want 2-stroke there are many 50 ish engines that would be a drop in replacment for your 46 also you could try a 12x4 prop, it would slow it down a little but give you much better climb with your 46

Hope this helps you some
Dauntae