Re: Pearly gates a2 or a5?
All good suggestions so far, in general.
But to give you a better more specific suggestion, I'd like to know what bridge pup you have in there now that gives you a "dark, muddy" tone. If you currently have a normally bright pup in there and you're still getting a muddy tone, then I'd suggest the A5 Pearly. If you've got a pup that is on a par with an Invader, then I'd suggest the A2 Pearly (and that may even be too bright by comparison).
So, what pup do you currently have?