I don't think you can force yourself to make a good choice. Gut overrules head, pretty much always.
Like you, I think, I think decisions come from head (logic), heart (desire?), and gut (intuition). The stay/go decisions, IMO, best comes from aligning all 3, but if the alignment doesn't happen, I'd go with gut.
Don't rush your decision. I know a fast decision looks like the quickest way out of pain, but it's not. Honor your indecision - you're making a decision that is likely to affect decades of your life. Let your heart and gut do their work. I know that seems like being passive, but it's not. It just takes time, sometimes, for gut and heart to do their work.
What does your heart say? I know she's not trustworthy yet, but what does she say?
Have faith in yourself. It's very likely that your heart and gut will align within a reasonable amount of time, given the decades you're affecting.
My sitch was very different from yours. I knew I wanted to R, and my W was definitely doing her work, so R was an easy choice for me.
Having said that, at 4 months from d-day, I was just coming out of shock, so my head wasn't working all that well. My gut and heart were, though.
fBH (me) - on d-day: 66, Married 43, together 45, same sex ap
DDay - 12/22/2010
Recover'd and R'ed
You don't have to like your boundaries. You just have to set and enforce them.