First of all, if you want to use it on an UFE account you care about you should use mouse-mode instead of memory-mode. Few months ago the old memory mode bring lot of users to ban. You'll lose a lot of efficenty though.
The best way is to maximize you damage (eg. with seprom/boosters, drill and havocs) and use a full speeded goliath with a distance of 680-700 if I'm not wrong