Ah Ha ! That's another reason yours is hard to slow down. I use an APC 15 - 8, about 9200 safely. I have never tried a 14 -10 and it may well be a very good prop but it has less braking and more speed than a 15 - 8. Try a 15 - 8 WITHOUT the Spoiler thing and see what you think.

Mine is also a bit nose heavy but I have no feeling in my right thumb ( neck injury ) and I like a little down stick inverted because it helps me "feel better."