Well I'm not opposed to only running it on the Sao Paulo circuit, it sounds pretty amazing from what you've said about it. If that's our best option, then let's go for it, and if we only have the forward cannon, it kind of incorporates the defenseless part when the zombies are behind you and the attacking part when they are ahead of you, like the best of both. I still think the best way to work the rubber banding is to just have a delay between when you get away from the zombies, and when they react to speed up to you. Therefore you would have a short break and not lose energy during that time. The BRs sound good too, I was just wondering how you ended up configuring that, sounds like it will be fun to try to cram a few BRs into the Nazca skillcut!

On a sidenote while we are talking about difficulty and rubber banding, I would suggest a harder yet difficulty for the single race and endurance modes, either that or to reduce the difference between the ship stats, because with iFreet, ATLAS, LOGOS, and Solaris, I can easily win any race even on Cassandra, which seems to have harder AI than Draco Cavernae. It would be cool (and challenging) to have a super hard mode, where you can never guarantee your victory, or something to even the ships. If I were to rank the ships as far as ease-of-winning goes, it would be:

Easiest to Hardest:

iFreet
ATLAS
LOGOS
Solaris
CEN-R
Amphithere
Zepher
Helios