17" Trubo twist wheels on 914 with fender flares, need help on set up Options

[Confused]

I wondered if anyone has tried to run 17" turbo twwist wheels on their 914. The tires that came on the wheels are 205/50/17 fronts, and 255/40/17 rears. Wanting to go less "chunky" on the size, I was advised to go to a 195/40 front, and a 245/35 rear. Also, it looks like I need approx. a 20mm spacer for the rear, and about 13.5mm front. Any help is appreciated. Confused.

[shoguneagle]

I am running front offset with spacers (205/45-17) and rears with spacers (235/40-17). Offset per front is 55mm and rear 52mm since these are Cup II Non Twisted. With these tires I can run larger tires in the rear going to a higher diameter such as 245/45 or 50, 255/45 or 50 which does not present too much of a problem. The fronts are a little different and appear to have a problem in the front lower fiberglass flare. Yes, I am running different type rims than the twists and the width of the tires may be different: front 7in; rear 9in).

I am only commenting to give you an idea of what I have been used. The front lower lip is the problem I will have in determining larger series tires thus I will be modifying them accordingly. My main purpose is to put as large as series tire as possible under the car since my suspension is stiff, the sheet metal has been seam welded uncritical places, and I have used several of Tangerine Racing stress kits in the rear critical areas. I need a little more give in the front suspension since on very rough road surface I move laterally 2-4 inches. It has a very critical edge which I will be trying to setup a little softer, corner weighting and balancing, and very tight alignment.

Not to confuse you but this is to give you a whole picture of how I am developing my project.