You are making more on that money investing it than you'd save in interest payments.

I'm currently stuck doing 1 or 2 flips at a time due cash flow constraints and needing to fund down payments.

You only have so much cash to put down in the form of down payments and renovation costs.

Basically catch up all the back payments the seller owes to stop the sale and make their payment until you refi. 

We are selling some property on Land contract and I would like to use a loan servicing company to collect the monthly payment, and setup escrow for taxes/insurance.

I was on the 6 month payment plan last year when it launched and was smart to do that and only lost $500.

Wouldn't this property negative cash flow by about $400/month with a 20% down payment? 

We do not have enough capital for a significant down payment OR construction costs and so we are considering asking family members for a personal loan OR proposing a partnership.

I look at about 1,000 properties a week and have clients all over the country including Ohio.If you could put your price range, down payment, expected cap rate, tenant type, location such as suburban or urban core, etc. then I could quickly tell you if what you are looking for is a 1 in 100 or a 1 in 5,000 property.

Keep it simple and make those principle payments.