I saw the same tests of that 'high capacity" battery and was equally disappointed.
I've tried apps and underclocking the processor during low usage periods. The problem is that everyone uses their device differently so what may work for me may not even be feasible for you or anyone else. Personally I have found that going to Settings ---> Accounts and sync ---> Google and unchecking the Google services I'm not using has done WONDERS in regards to decreasing battery drain. I am unwilling to give up on Gmail syncing so that stays on but everything else is unchecked. Now I have my e-mail syncing and much less battery drain.
There are other threads in the General section discussing uptime and tweaks but a better battery? Again, not that I have seen.