Don't compare yourcar to your friend's, BECUSE ITS NOT THE SAME, you already found that out. Pro's can't even build two engines that are the same, how can we? Everyone is giving you good advice, take this information and study it, ready some good tech articles, ask some more questions, get some more advice and decide on a plan of action. Only change one thing at a time and note the results.
Consult with the cam manufacture as to what stall, gear ratio, tire size,l etc that he recommends for that grind. Re-read the advice that was given to you today and see how that equates.