I respectfully think you're fooling yourself. And no i don't sell compressors for a living so i don't have a pony in the race.
There's a reason why the compressors that are used for aeration are completely different than the compressor you're using.
Cfm for cfm you're using more watts (which is what you're paying) and your compressor is not designed for continuous use. Sure you're saving money in the short run but losing money in the long run.
I doubt your diffuser can match the performance of a membrane diffuser and self cleaning ability either.