I think your making life hard for yourself going for any single vac machine , i know you dont want to spend ( invest ) in good equiptment , but id bet if you had a machine like the new twin 6.6 miniflex with 400psi , together with a good inline heater , you would be going through your EOT jobs at a much faster and easier rate , with better results .
I would try and get good lightweight twin vac system working , if you found a used ashbys sensei ... preferably a newer one with the 220 pump and higher power motor .... the sensei has an exhaust port on the back to connect a booster .... the booster could be ashbys own booster ...or the airflex 6.6 booster pod ... or one you make yourself .