Someone else had a nice write up on this topic, but I can't seem to find it anymore since it was not placed in the How-to section of the forum.
I am 6' tall and still find the Recaro seat pad angle to be too steep downward. I felt like I was always having to lean forward just to get a decent view while driving. So I followed one posters recommendation of adding steel spacers on the rear bolts of the drivers seat to increase the height. Increasing the height also provided better thigh support.
Step 1: Remove the plastic bolt covers from the seat rails.
Step 2: Remove the two existing rear bolts from the seat rail. The bolt is a 10mm with 1.25 course thread. Go to ACE Hardware and buy the same size bolt but with a length increase of 1". Also buy two 10mm lock washers, four 10mm butterfly washers, and two 1" steel spacers. I purchased the grade 8 bolts which offer a high tensile strength.
Step 3: Take the new bolt and insert a lock washer, butterfly washer in said order and insert it into the seat rail hole. Then insert a second butterfly washer into the bolt and then insert the 1" steel spacer. Now place the bolt in the threaded hole and tighten it down just a little and proceed to insert the second rear bolt.
I had to loosen the two front bolts in order to allow me to straiten the rear bolts so
that I could insert them in the threaded holes properly.
Step 4: Attach the plastic bolt covers.
Total cost of the project was around $3.00 and the seating position is just right for me now.