Laying the away-underdog (in specific leagues)

[yrufset]

Hello all i'm trying a strategy these days and i would like to hear your comments, if you have some: I did a little research to find the leagues that have more Home wins than the average. in those leagues, i'm looking for a game between a home-favorite (odds around 1.7 and below) to an away-underdog (odds from 4 and above). After doing a little more research on the specific game (last 5 games statistics of both teams, position, and general statistics) i then lay the underdog if i think he's not likely to win, for a liability of 10% of my bank. I know, that's really slow profit. but it's steady. after backtesting this strategy i found out that a losing bet might come once in a while, but not likely to occur more than once in five games. So i thought: why not go Martingle when i lose? i can chase my loses because they are rare! Well, that's about it. any thoughts?