So last night I had a wild hair to swap out a feat for another toughness.
On my lvl25 Stalwart Defender (18ftr/2mnk) in Unyielding Sentinel destiny. Before the feat swap I was standing at 1893hp. After swapping Improved Sunder for another Toughness feat I was up to 1896hp! Woohoo!! Swap a feat and gain 3 hp's!
I know I am not the sharpest tool in the shed, but shouldn't Toughness give at least 20hp? I entered a bug report on this, but a dev response or community input would be appreciated on this issue.