I'd start it by exploring hands one by one in the betting range, and think, what size does make sense for this type of hand considering the overall ranges, map out advantages, and disadvantages for hand groups in the range of them betting certain size. And then think of the frequency of these hand groupings in your range, and examine what size makes sense for your overall range, with the advantages maximized and disadvantages minimized. Or does the spot actually call for 2 betsizes due to so many different type of hands in your range.
Yeah its pretty non specific overall advice.
About the example, betsize on river spots are very simple, flop and turn sizings aren't. On river spots all you need to consider are equity and blocker effect, and you can deduct betsize from there. Though I can't come up with formula that takes blocker effect into account now on the fly, though it should be possible with a bit of thinking. But there's a formula that gives you good indication of what betsize you should use OTR.
Quote:
The bold is impossible unless the ranges involved are identical.
I think you misread this.