Do you really find your strategy of buying so many point effective? Personally, I just don't see it. Betting at -170 for most of those games doesn't seem smart. Thats A LOT of money you're losing right there. And you're still bound to lose a lot of those games.
basically if you laid the same amount on each game, you'd have to win 2 out of every 3 to show even a marginal profit
Also to buy points down to -1 or -3.5 doesn't seem to be worthwhile. I can see it in a case like Kansas buying that down to 2.5 because many games are won by field goals (look at the push frequencies of different spreads).
The only time i buy points are when the line sits at -/+3.5 or -/+7.5 and I want to assure myself at least a field or touchdown margin