A couple drops of Fermcap in your boil will reduce the chances of boilover and help you eke out a few more quarts from that pot. Ultimately, you will probably want a larger kettle but the 6.5G one will still be useful as, e.g., a hot liquor tun.
I picked up a little trick from somewhere: After I vorlauf a few quarts, getting the runoff mostly free of big chunks, I take a nylon hop bag and tie it around the end of the runoff tube. That catches anything else that tries to slip through. For a typical-sized batch I usually wind up with a...