Our series and the German race run the same config/rules. Only diff is tires type and that is due to local track and cost considerations. I can recommend the same, keeps costs down, its fun, and is all proven to work/last the distance/time:
Only two hops allowed:
Gearing - the 53665 gearset. This gives a higher topspeed.
Since everybody uses both there is no effect on parity and makes the racing more enjoyable. And without bearings the kit is unlikely to last
Shocks - The first year we used the kit std no moding (same in Germany). For the first race this year (we have 3) oil shocks and any silver type kit spring were allowed. This caused confusion, grief, and whispers / aggravation about cheating when it caused some team tires to overheat, underheat and generally be problematic. This was a spoiler. Stick with the original rules, kit friction shocks and springs only. They work fine. Infact they are better because there is no maintenance.
Propshaft and all other part are completely kit (plastic) std. The car lasts the distance. No need to change anything and spend more money.
Everyone the same and have fun. 2 sets of tires, a third set is at cost and incurs a number of penalty laps, same for motor swapping. I can't remember how many laps penalty as we never use it! But I will check and post it up.
Also a min number of team members helps. 3 at least. The lowest budget team also managed on just 4 lipos and 2 chargers!