I'm big on getting the cg forward of half way & the cp as far back as possible, it just makes sence to not try & shove an arrow backwards. I've seen too many back heavy cars come unglued at the salt. You can put a lot of lead down in the steering cavity to weight the front up without unloading the rear, which is what would happen if you put weight in the spare wheel well. The cp is going to be tough to do much about on a beetle. Hitler never thought we'd be racin these things, but I believe the tail will help. I'm not sure who came up with the tail first, me or Porsche, it was about the same time. They had fences & spoilers & all sorts of stuff on theirs, we just had painted food on our barbique plate.
Ya know what , that gets me thinkin, I've never seen a good old ozzy style barbie up here on the big island (US). You know what I mean, a pile of bricks with a hunk of 1/4 plate on top with a fire under it, I miss that!
I ran into a bloke from WA at speedweek this year & he said to me " you've been gone too long mate".
I think he was right.