If it works fine with an EvoII then it ain't your marker, it's the loader.
Have you got the loader speed on your Fly set to 'sfast' - if you haven't you need to.
Secondly - does your breech make a slight click when you swing it shut? If it does this is a good thing. If not, you may want to adjust the ram stroke a little (details in manual)
Now, if it is the loader (sounds likely) then after setting it to Speed 1 you need to first look at the paint you are using. 99% of the time if your Reloader B is crushing paint it's because the paint is poo or too fragile. Try getting hold of some Draxxus paint. Inferno, Blaze or Hellfire all rock through Angels (as long as it has been stored correctly). I also know that Zap 420 works fine through them - as both these are known to go through Angels and Halo's fine try them either of those should work fine.
Out of interest, what paint have you been putting through it so far?