Sorry for a delayed response! I agree with your thoughts and I will consider a second pair of batteries in parallel with the first (if space constraint is flexible) as well as the use of the pro-mini (which might actually be more fitting because it'll last much longer). Will tinker some more and see what comes out of it.
Anyways, I think we have been able to resolve this issue! I learned a lot in this process and am very grateful for your and everyone else's responses! Thanks everyone for your help and input!!! Consider this question resolved! 