A couple of things to try...
In your MAMP settings, I would first consider clicking the "default" web ports option to change your apache http port to 80 and your mysql to 3306. While that may not make a difference in speed, it will put your testing server on the same ports that will be used on the web in a production environment. Naturally, I like everything about my testing server to mirror the live server as much as possible.
With the remote server attributes, you would not need to put the local stuff in there... it would just go in the testing server setup. Again, not sure if this would cause a problem.