its my policy to try to participate in every bounce.. even if that means I only sell a little.. I have often missed a bounce and then it will crack another base and go lower without me getting to sell.. Thats why I try to sell some on every bounce and then you can rebuy when it retests your base or cracks it.. There is no math or exact formula for taking profits.. every profit is a good profit.. but basically you wait for a crack of a base, then you watch for panic selling to creat a drop from that base (usually consecutive red bars) then you know your safe to buy (high probability trade).. then you sell into the bounce at any profit, even in layers as it goes higher if you want... and it should atleast return to the base it cracked, and if it doesnt, hopefully you got some out on the way up...