Which of the financially feasible uses is maximally productive?

I don't think you should ever maximize or overuse any source including your HELOC.

.- How can it be used for whole tail deals to maximize profit?

I just want to maximize every hour I'm putting into this process and not let anything to waste.

- How can I maximize my learning over the next 12 months? 

The area it's in is very nice so if we wanted to resell it would take closer to $100k for us to maximize the money out (the area can handle it).

This is the person who finds property, identifies the goals of a project, decides what to build there (amongst many, many options) to maximize for those goals, raises the money, hires the team, holds people accountable for timelines and commitments, negotiates contracts, solves the problems, and overall sees it through. 

So if you do the 30-year instead of the 15-year, you will maximize the advantage of that monetarily because ultimately what you end up paying back, with the dollar value of that time, is significantly less.

We work throughout Indiana so if you want more in-depth info on how to maximize LinkedIn, let me know and I can chat further and go more in-depth.

Anyone has a recommendation for an accountant who can help me maximize my tax deductions.