We have done the same with our LMB genetics. Bob's is another data point on the I-40 Fla LMB general boundary. RML is , I am guessing ,about 75 miles south of I-40. Below I-40 as a general matter (subject to local conditions which control) Fla LMB will survive and do ok - north of there Fla LMB performance declines to 0 viability the farther north you go. F1s will do ok north of I-40 but I have seen no info on how much further north before their performance drops. Northern LMB do well until you get into peninsular Fla ( I-10 and south).
Parking some LMB winter feeding/growth threads here.