line changes and price lock

Does anyone know for sure if changes to lines while keeping the same plan impact your price lock? I want to port out 2 paid lines then port them back into 2 BOGO lines I set up over a year ago but do not use. I then want to add another BOGO pair in 3 months, basically swapping a paid line for a free line by doing the whole process. I don't want to do this if I am running the risk of getting hit with the $5 per line increase though. I switched to Magenta Max during the pricelock v.1 period and my bill has not gone up and I would ideally like to keep it that way.

Thanks in advance!

Magenta Max 9 lines, 5 paid, 4 free (includes one BOGO) Goal 4 paid, 5 free (2 BOGO pairs)