+EV for baseball parlay?

[tjd2001]

I just wanted to see what you guys think...I have started a little study on whether its +EV to parlay all my runline picks (-1.5) with the total runs over. I would only do it games in which the favorite is NOT throwing their number 1 or number 2 starter (the rational being that the extra run they must win by - or a larger proportion of it - will come from greater offense rather than from good pitching...thus contributing to a greater likielyhood of the over hitting (i know this is incredibly obvious, but i was to see if there is a real significance. So far i have explored about ten teams over the last two years taking all times a favorite covers the runline and is not throwing there number 1 or 2 starter (i choose before analizing each teams number 1 and 2) and checking it against the over/under.
While my results have been positive, by sample size is extrememly too small...i have a lot more work to do but before i continue a few questions...
I was wondering if a) do people think this makes sense?
b) if there is a baseball searcable database similar to sportsbookpal?
c) if anyone has done similar research?
d) are there any other parameters you may recommend including (e.g. only large favorite -175 moneylines and better)?

TJ