re: cage doesn't help.
That comment has come from radvalve users. Not from DFII users
1. I found it to be untrue, even for the radvalve. It's better than oem. Not killer, and maybe at the old price of $160 could be considered not worth it. That was more the issue anyway. Under 'bang-4-the-buck', a radvalve compared to a set of power reeds on the stock cage wasn't a real thriller. The radvalve has recently been cut in $ about $40.
2. The DeltaForce II (gotta be a II!!) is far superior to the radvalve.
Power reeds (boyesen 607s) are a good choice for the stock cage. Considerably less bucks, if that's an issue. Make sure you take the oem reed stops off.
No one can tell you what jets to run. Someone else's setup might be close to yours (might not, either!), but YOUR bike has to be jetted to suit YOUR riding style.