2013 Blackwidow Ultimate

Hey all. I have a 2013 Blackwidow Ultimate and I have an issue with a few of the keys on the number pad either not registering a press or sometimes it types double characters. I have tried popping the cap off and shooting air while I press the switch, seems to have helped a little , I think.....The worst keys are the + key and the 6. I think I fixed the 5 key. These keys are not used much really, but when I need them it is annoying (entering credit card numbers, bank account etc....). As i am typing this i noticed that maybe the enter key is also sometimes affected. My questions are these: They are Cherry MX Blues on this model, right? But i cant just get cherry blue and solder them in because of the led? Do I have to get razor versions of these switches? Also, I never use the macro keys and probably could switch them out for the affected keys, but this approach still leave a less than 100% operating keyboard..... Thoughts anyone?