I played with both the Wilwood recomendation and the Tilton one. Both will bring you car closer to balanced bias then you are now (bias bar centered of course). One will simply result in about 15 pounds more pedal force then the other. Tilton will be right about 75 pounds of force which is the commonly recommended starting point for a race car setup up. After that comes driver preference and style of course. Personally, I have found 75 pounds nice in race car where you are strapped in well in a seat with little padding that does not move around much... haven't liked it much in the typical cobra.
The Tilton combination is well balanced (all looking at a 1g stop and a 20" CG height)). A slight forward bias of about 2% while the wilwood is more like 16% rear (about 32% rear now). Rear would need tuned out. Other combos could be 5/8 and 13/16 (4% front bias), .7 and 7/8 (3% rear) and 13/16 and 1" (6% rear). Ordered in the rate of increased pedal effort from the 5/8 (40 pounds or so) to the Tilton combo of about 75 pounds.
Regardless of what you do, can't wait to hear the results.
