I suggest you call Bob Lusk about the situation as he managed an upper NY lake much like that described.

BTW welcome to the PB Forum. You have an interesting project.

Often LMB don't do well that far north. Also when there are LMB and SMB in the same pond the SMB don't do as well or reproduce. See this link.

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=5;t=000601;p=1