Theo if you are not going to protect them for the first half hour with a net or cage then I suggest that you pick the place that seems best and a few mins. before you put them in by use of a pole/paddle/noise disturb the area to drive off the LMB. Then stay in the area at the edge for an hour with the pole working the perimeter to keep the LMB off balance. Also adding a couple pounds of FH with the HSB will help disorient the LMB. Also separate and apart from the considerations above as to when to stock keep in mind that with cold water the HSB have 2 advantages 1) they are more active in cold water than LMB and 2) LMB feeding is sharply reduced in colder water as a result of a slowed metabolism. Anything that improves the HSB's advantage for the first hours means a higher survival rate.