Quoted from Nokoro:I was thinking about trying to make some of the settings on Special Force a bit harder. One thing I noticed is that I always have a ton of rockets. More than I know what to do with. I was thinking about turning RECALL ROCKETS off, which I believe would reset the number of rockets after every ball. Has anyone done this or changed other settings to make things harder?
(I'm pretty generous with extra balls as well, so I could also up those target values.)
Rockets just seem a little half-baked in the rules. Having too many of them isn't the only problem---the other issue is that they have too little effect on gameplay to be worth trying to earn.
If I wanted to increase difficulty, I'd focus on dialing in the tilt (if you are finding it too easy to save outlane drains through the gates) and perhaps try some fatter rubber on the mini posts.