The acid concentration should be 3 parts distilled water to one part battery acid , You quoted 64 and 192 so it sounds like you have that right.
Also sounds like you haven't seen the 720 rule calculator yet else you'd be able to get the time and curent down right away.
Here is a link to it.
http://ndhsubmersiblescience.com/ano/720rule.html
I think you said you had 4 sq inches. If you plug that into the calculator with 1mil and 6A/Sq ft you should be anodizing at 0.17 amps for 120 minutes.
Just pay attention to all the details of time and temperature in the whole process and you should be ok. Don't guess at stuff.
Sage