Ha , thanks for typing that Robin , i an too pooped for typing long things.
Easiest way to upgrade enforcer is fit another 1500w motor , the one attached to the tank is 1200w , throw it out
You can get the 1500w electro from john kelly (restormate ) or alltec . You will be drawing 14-15 amps on the one cord , its never an issue for me but its up to u .
Yes fitting two 6.6 could be good also the airflow is about 30% more . I hahve to play around with this more .
2" hose and 1.5" show the exact same max lift on a guage .
The time it takes the gauge needle to get to max may be slightly different but visually i could not see a major difference .
If you have a four vac series /parallel setup the needle rises very quick to max .
Another reason the 6.6 may work well in series as the faster rise seems to be related to airflow increase .