I had a conversation at World Cup, with somebody who knows a thing or two about both the Rotor and Reballs, on the subject of the using them with this loader, they don't work too well with a standard Rotor, too much static generated apparently.and that's using a rotor, haven't tried with another hopper yet.
I'm sure there will be more information from Scandinavia soon!
Oiling them may be a short term solution, however, I'm not sure what the long term effects of baby oil on the shell of the Reballs would be, you may find the shell material degrades after a while.
I suggest it may be a better plan, in the long run, to try another loader out.