The tank is a tank --- as long as it's RATED for the psi you plan to make....
The reason that twin piston compressors come with higher rated motors -- it takes more motor to make more air....
Here's the trick that most people miss. You must look at your air tools - owned and planned to own -- and see what CFM @ what PSI they require to operate. It's easy enough to find with Google etc these days....
Here's my personal feeling about what you're thinking about doing... it may end up costing you more effort and dollars and you might still be sadly lacking. I'd SELL the current compressor --- and just buy one that will do what you need it to do. Look for a compressor rated to make the PSI @ the CFM you're going to need. They're not all that expensive -- but my guess is -- it'll be 220V.
A decent compressor is something you're going to use for the rest of your life -- and always has some value if you decide to sell it.
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