Ok, ive also made this mod and ran it at Blyth. On my car it takes 20g from the front and and adds it to the rear. Which is a 2% change. The reason my car was slow when I was on the track with you on Saturday is the only saddle packs I have are some elderly 3200 20c jobbies
On mine the receiver is on top deck over the cells, the servo is mounted like a nimh car, and I have further plans.
Jonathan, check your PM's