That's a good idea but spoilerons will makes you to descend faster. Last time when you were nose heavy your plane won't land due to more lift and since you've feel great with flying that's why we recommend to add spoilers to increase descend rate as you can see from our earlier post. How come now your plane has lesser lift when you move your CG back? Should be lighter or you're probably using same landing style as you were nose heavy before. If you are comfortable and more advantage with your present CG leave it as it is otherwise if you want to descend smoother and slow, move your CG forward and raise your AOA and with power on landing but if you gain more lift then you can use spoilerons. You can probably change in between where you can avoid using spoilerons, as well as being too nose heavy. But at this time because of the new nature of your plane I discourage you to use spoilerons. You can use slight flaperons would be better to slows down rather than using spoilerons at this time. With your flaps you can reduce AOA but still have lift. Spoilerons is applicable to increase your descend rate but not to lower your speed. However in some way it slows down the aircraft by increasing your AOA as spoilerons increases your stall angle and it creates pitch up moment depending on the nature of an aircraft and stability. It also use to increase authority by increasing speed.