I have tried the brass bulkhead several times, but always reverted back from it, the car just seems too nose heavy, I think it works if youare running really hot motors and with a very aggressive style, like J. Neumann. But for most I've seen the car work better without it. We do tend to use the cream under servo weight, and an alu bulkhead, or run with the plastic bulkhead and add weight on the servo.
My reccomendation for you would be to get the under servo weight and add stick-on weights to the servo as needed.
This is hat we mainly use on astro and carpet.
/Greger
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