XRAY - Model racing cars

Hi there!
couple of weeks ago I tried to race on small diameter foams. Despite the fact that I had the fastest car on the track I ran into several issues:

- Only 24mm tires fit the rear end (can be fixed by modding the a-arm)
- Team drivers seem to run 28mm width. Haven´t found them in this width so far. I ran Ellegi gas car tires. Which one shall I buy? Different hardness? How about unequal tire wear?
- I can find no basic, or team driver setup-sheet for the FK04 on foams

But the biggest issue was: I was not able to get up to the same traction level as the rubber tire drivers without saucing my foams. This led to the problem that I had to sauce my tires multiple times (prior to every heat) and gain more and more steering. This ruined my race eventually, and I went back on rubber for the next race.

Could someone guide me in the right direction please? Many thanks in advance!