Joe,
It's very rare that a carpet will need to be agitated in that last inch or so on a stair or adjacent to a skirting board.
The exception would usually be a spillage (maybe a few square inches?) and that could be done with a hand brush.
It sounds (in the nicest way) that you are overdoing things. I would recommend that you take up Craig's offer.
If you are going to scrub every square inch, then as Ian suggests, you had better charge top rates for that approach.
Apart from the SEBO, what kit are you using?