[Josh W]

First off, a lot of books won't let you do this.

Secondly, I'd suggest you do it only with odd-numbered totals (i.e 7, 7.5, 9, and 9.5). The reason for this is:

Lets assume the total is close to accurate. If the total is 7 or 7.5, then it seems reasonable that 8 runs being scored is more likely than 9 runs being scored (and 6 is more likely than 5, but since you said 'over', I'm only focusing on the 'overs').

Since 8 is more likely than 9, 5-3 is more likely than 5-4, which is nice since you are more likely to win the -1.5 portion of the bet.

If the total is 8 or 8.5, you need to fave to score 6 runs. But at the same time, if the total is 9 or 9.5, the fave still only needs to score 6 runs to have a chance to win.

If the total is 7 or 7.5, you need to fave to score 5 runs. But at the same time, if the total is 6.5 (rare, but hypothetical), the fave still needs to score 5 runs to win.

I wish this was easier to explain in words. GOod luck,

Josh