Rename you admincp and modcp directorys to something like:
"FoVCPY6ANhYXl73lwmCTjZ8gxYWUzGu5uG79e4ArbYFDW8oJl r"
Use tubenets pass generator to get dir names. http://tubenow.net/pass-generator/

Password protect admincp and modcp, (once again safest bet use a pass generator http://tubenow.net/pass-generator/)

Remove the thread.php file from modcp as that is what they can use to prune the forum, As your smods shouldn't really need to mass prune as they can do it through the forum.

Make sure you use secure email accounts. best option is to use a personal one like blahblah@yourdomain.com so people cant revert it like at hotmail. also make sure all mods don't use hotmail as it is easy to revert.

Also what you could do is if you admin account keeps getting hacked is setting up a user account random make that full admin but make it look like a normal user and just use that to do admin stuff then make you account have no options in admincp or very few so people will try to hack you account and if they do they can't do fuck all with it.