Proton Satria GTi HC

[Trikes]

Hi Guys I'm racing a Proton Satria GTi (FWD) on Tarmac HC's. One Track has a tightish right right left but the track two Rounds later had 31 bends in 1.89k's (and it was wet!) and the rear end monopolized the times achieved. I've decided to make a rear wing (Hatch back style of car) but I'm pondering about thickness and material type for the Mounts. This new wing will be a foam core with the mounts buried in the composite. As it's going on a Hatch the Mounts will be below 100mm in height. My query is what are your thoughts on ideal Mounts thickness? I made a Gurney up for the std Factory Wing and a small improvement was noticed. I hope we can talk about the Chassis Set-Up / Tuning elsewhere.