This is a regular conundrum, with several inter-related dynamics. I don't think it's necessary to dissect the numbers to the nth degree.
Big question, I think, is whether losing your $10K bankroll is critical or not? If not, then it's a judgement call as to whether you want to play with a 13.5%, 28% (whatever) RoR or not. If you can't afford to lose it, then the consenus here is that the 1-8 spread you're proposing, and the +EV that drops out of it, doesn't justify the RoR.
What value does $10,000 represent to you?
If it's your life savings, don't do it. If it's a month's pocket money, and you'll have another $10K next month, why not? You don't need sanction from anyone here to to it.
If the decision point for doing it, or not doing it, is whether the RoR = 13.5% RoR or not, why is this so important? I think that's something contributors here are puzzled about.