Only 6 posts and asking people to race? Are you serious? If your car feels that much slower, take it to Toyota and demand that they inspect it, otherwise you'll just have to live with it.
given that it's 15% rich, i'd say you either had a problem with: 1 pre cat O2 sensor (most likely) 2. MAF sensor (likely) 3. Injector issue, possibly the regulator is not lifting (unlikely but can happen)