This is also borne out by the storyboards found on the DVD and Blu-Ray, which depict General Chang (pre-Plummer casting) as much more strongly resembling the "traditional" TNG/movie-era Klingon, complete with long hair, more pronounced ridges, etc.TUC was all about nostalgia. The film gave us:
1. Enterprise vs. Klingons
2. A TOS-style Klingon, complete with fu manchu moustache. Yes, Chang had ridges, but the homage was pretty obvious.
3. Kirk battling his evil twin.
4. McCoy operating on an alien
5. Scotty freaking out in Engineering
6. Kirk saving the world
etc...
In regards to your second point, I've always heard that it was at the insistence of Plummer since he didn't want a bumpy forehead.
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