John,
That would be a good question for Daryl of XF6/VTXtreem... Yes, he sells the raked TT's, but he strives for happy customers. Give him a call, ask your questions, and be ready for a geometry lesson

Daryl really knows his stuff, has hundreds of his trees out there (VTX's, GW's and HD's), and will not lead you astray.
http://www.xf6-custom.com/ (he is a club sponsor too).
Yes, he's my friend, I may be a bit biased, but other VRCC'ers that only know him as a vendor, will back me up.
Good luck!
Black Dog