burton51m,
You really can't beat what the designers came up with.
They designed the perfect spoiler for the MKIII.
Any step away from what they did, is a step away from perfection in my opinion.
Checked out your site--you have a really clean and classy looking car.
If I were you, I would not change a thing other than to get a MKIII '89-92 spoiler for it.
That and lose the sleepy eye deal (if I may say)...if you have not already.
All this car needs, IMO, is a stock 3pc wing: