I frequently play a $50 min table and spread from 50 to 600 (6D). I'll usually buy in for $400 with all green. If the count goes up and I start ramping my bets and get a few wins, I may ask for blacks. If I bet the blacks, the dealer often calls "black action" and the pit boss may take a little more interest. As a result, I usually continue to bet greens (12 greens usually gets no response, while 3 blacks gets the black action call). So here's my question - when do you start betting blacks? Do you continue to stack greens (even 20 or 24 of them which is a big frickin stack)? If not, how do you transition to blacks with the least attention?

Also, because of my small initial buy-in, I often have to rebuy if I lose a few hands in a row when the count is good. At this point, do you continue to buy-in for only $400 (which might be only one round) or do you now buy in for a lot more?

Thanks for any advice.