I think a lot of people whom hit their seven irons very well (me being included) automatically assume that this will translate over to the single length be it a 3 or a 9 iron. The fact is not everyone can, will or should.
I was very intrigued by the one length, until I went for a fitting; The 9 and PW felt far too long to have any control and ballooned. The long irons had such a flat flight it didn't feel right. Glad I tried them, they just weren't for me.
You mention that you don't like hybrids and 7/9/11 fairways are out, so you could try utility irons? Otherwise accept you don't have the power, speed, ditch 4/5 iron or get yourself down the gym and Bryson yourself up. Or try a lighter flex/graphite shaft in the 4/5
The other question is the driving range over regular golf. Often at my local range there are people that just come to smash a bucket of balls and have no actual interest in playing golf. Could this just be people loving the stress release of hitting balls. We all have met those people whom state...