This stuff is awesome. I'm not surprised you have burn-out. I have a couple of "why" questions based on my initial impressions. I know that the "why" word can come across as challenging, or even hostile or critical, but please don't take it that way. I'd just like to know what you were thinking when you made some changes.
"Elves are taller"
I've always thought that D&D elves are too short (although I seem to remember that Tunnels & Trolls elves were too tall). However, given that elven height wouldn't make the top 100 of most people's complaints about D&D 3.5, why bother to change it?
"Gnomes have bonuses against sahuagin and locathah"
I am primarily a world builder; I try and make sure that rules changes to have an in-built justification in the campaign world (as otherwise I find myself tinkering with the rules just for the sake of it). I don't like that 3.5 has an implied setting (slight as that setting is) and 4ed seems to be worse in that respect. Do you have an implied setting whereby gnome hatred of sahuagin makes sense? Is there a reason why sahuagin don't repay the favour and get bonuses against gnomes? (Or maybe they do.)
"Psionics Handbook"
The introduction refers to the Psionics Handbook rather than Expanded Psionics Handbook. Are you using 3.0 psionics?