You have had a BG spawn. You are a little north of some posting here so stocking is a bit different. I would suggest given your situation that you check reputable hatcheries in your area and look to buy 25 6 inch LMB. That is enough to start with. Be sure the hatchery knows you need about 50% males and females ie first stocking. IMO it is late given your situation and your area to stock 2 in LMB fingerlings. It could be done but the results would be highly variable. Not near as much risk at this point in stocking fewer but larger LMB.