43 isn't too bad. I don't like phone getting that hot but it does occasionally especially since I have the rezound now and 45-50c is considered average!
What gov were you using? The CPU frequency doesn't impact temps too much. Its mainly the screen pulling juice and heating the battery. Best you can do is keep screen as dim as you can take it and underclocking a bit will help just a tad. I like sbc as well but like I said earlier, savaged Zen has an extra app called sz manager I think its called to disable/enable sbc whenever you want (when not charging ) give it a shot
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