"I'm here to learn and share.Thats all."

That's why most of us here.

" feel there is a bad wind blowing here.I do hope it calms down"

That's cool. It's calmed :wink:

I realise why you want a buffer. In theory it makes alot of sense. Only bet on large overlays and then you're much more likely to be betting with +EV (positive expected value). In practice it's not that simple though. A large overlay means either you or the bookie are pretty off. You should check the market and other sharp bettors for their opinions. If other sharp bettors seem to think the line is value, then you are probally fine. If they disagree with you about your large overlay, you may have missed something they didn't.

I'm not saying large overlays are not profitable, you just have to be careful.I don't think you should exlude smaller overlays. The smaller overlays are generally where alot of bettors make their money. You should really bet any line your formula/system says is value.

If you exclude the smaller overlays, who might be throwing potential value away. As long as you are more accurate than the bookies longterm, these smaller overlays will profit and so it's worthwhile betting them.

Not saying what you are doing is wrong, just offering an opinion I've formed from my own experiences as well as the views of experienced sharps I respect.