Good grief! Stopped out again. This is starting to hurt as I have gone 9-11 on a rolling 20 trade count for the first time since started looking at this indicator.
Welcome Gelly - You've joined us in what I hope is a temporary trough in performance. With regards the points margin, I use long price from the SB +2pts or short price -2pts. However, I don't think it really matters - it will be extremely rare that price will hit bid or offer and immediately reverse: on the other hand, you could take a more cautious view and decide to only enter after price has gone say 3, 4, 5, or 6 or even more pts beyond the SB price. BB is something you can play around with to find comfort as well as sheer performance.
As for no-trade days, I currently see the BB High-Low range: if this is 1.25 or more x the 10d Av. BB range, I will stay out. Actually, again, you can play around with indicators in BB that will keep you out on highly speculative days. the rationale is: if price made a huge 100pt range between 8 and 9, how likely is it that it will escape from that range and put on another 20 or so? - more likely it will either trade within the boundaries all day or peep out and then collapse back inside, triggering first an entry then a stop. Any indicator what recognises this will do, play around with it, but keep us in the loop, please, in case you hit on something.