Do you know your alkalinity ? That is the thing to measure because as shown below pH changes during the day.You can stock now and add lime as possible. Use ag lime not hydrated. 6.5 is ok the optimum is 7.4 which is the average blood pH of fish.

Jeff I would go ahead ASAP with the FH , TShad wait a mth and add the BG/RES then stock the LMB at 6 inches between Dec and Feb. No change with not feeding provided you have a plankton bloom.