I thought the same thing when I bought my RV4 last summer, so I moved the front seat back. I moved the bottom hinge back 1 1/2 inches, and the upper seat back support back 2 1/2 inches. This gave me 1 1/2" more leg room with 1 inch more rake - quite comfortable. I'm 6'1", 195 lbs. It did require rebuilding the support structure under the seat back support/roll bar for rollover protection, and I had to move the canopy cross brace aft 2 inches. It took me a couple weeks to figure this out and implement it, but it was worth it. Also, unless I modify the back seat stick, I can't use it because of interference with the forward seat back. It's still great for giving rides, but the back seater won't be flying unless I modify that stick. That's not important to me anyway.
I'll be at Oshkosh all week this summer (with a for sale sign on it) if you want to try it on for size.
2001 RV-6 - sold 2005
2008 RV-8 Fastback - Sold 2016
RV-14 Wings - sold 2014
RV4 - Sold
Cessna 182RG - flying
New RV8 - Finished and flying 4/26/18