Of course, picking a spot that favors you is not always as easy as it would seem.
My advice is that if you are looking for a way to make the odds as even as can be (in other words either side is not trying to hustle the other) then play short sets (say to 5) and make adjustments automatically after each set so you don't always have to renegotiate the spot.
For example, if you get the straight 8 and lose the first set...AND you think that the spot is still fair, then the next set you get the straight 8 + 1 game going to 5. If you lose the second set you get the straight 8 and 2 games going to 5, etc.
Then if you win one,you go back to one less set game spotted.
You will invariably have to donate some money to better players to get them to play you, but always try to play "as good as you can for as cheap as you can"