For long term buy and holds, I would just get a conventional mortgage, as those will have the best terms.

Should I go to a portfolio lender, conventional financing, use FHA loan financing (is this possible for a home you already fully own?)

If you ever need helping moving inventory feel free to reach out to me.

Looking through the Texas listings, these are new listing and not old inventory. 

I switched to "subject to" properties so I can become the true owner of the property and that gives me more rights to offer less conventional financing.  

I own several rental properties and now looking to increase inventory so I can fire my boss at my  current day job and go full time with REI.

HOWEVER, another option (Depending on what your current home situation is) would be to REFINANCE your current VA loan into a conventional, which would re-charge your VA eligibility to 100%. 

They learn how to handle straight peer-to-peer conventional transactions and tend to work within that box.  

Honestly, I have just started to educate myself on the real estate investing and this whole time I was thinking the only way to invest in real estate is either all cash or conventional mortgage till I started reading blogs here and took the free mini course.

Have you tried looking through local wholesaler inventory or homepath.com?