This would allow someone to understand the bigger picture of their investing and the larger goals they have.

You need to calculate it as investment income - expenses (including annual taxes and income taxes on your gains) - increased equity (loan paydown - that is part of your profit, but it isn't part of your cashflow)If you are looking at this on only a monthly basis, you'll miss annual or semi-annual costs or seasonal variations. 

Is there a T12 - 12 month profit loss statement ?

I'll accept getting a pretty measly profit margin since its my "throw away" first flip.

I’m looking to move up to larger sized properties from the two 3-family properties I own now. 

I’m starting a new build of a duplex that after completion can net me 200k profit.

You'll need a much lower priced property with some value add or larger equity spread, and also have the funds to make the payments in case it doesn't play out so smoothly, or there's delays getting renters/lease-option buyers, etc... 

Should I sell for a small profit and use the cash to make down payments on multiple properties?

I have yet to hear any input on thoughts for what works out better, what makes more profit, what makes loans easier to obtain when it comes to flipping a house in Philadelphia.

Duplexes or larger.