It is typically lower than cash-on-cash and you can put it somewhere around 6% conservatively.

The monthly payments are great, but the issue I am running into is what to do with idle cash.

How did you achieve this type of cash flow?

A grand negative cash flow is not the issue.

Without any cash it is unlikely unless you can find a 100% seller financed deal (they do exist, I just did one a few months ago).

Second to cash in the bank is HELOC cash because you can use it however you want (you just have to see it already in an account).

A cash out refi should take 2-3 weeks with most lenders, and you should have only an appraisal a credit report fee as upfront costs. 

Quote from @Shawn Questa: A few times I've reached out to Cash Buyers and they would tell me that they are a part of an Investment Group and that they are ready to quickly Close Deals would be happy to work with me.Later I would come to find out that they are actually a Group of Wholesalers, like me.I guess I would prefer to Work directly with the Investor, Cash Buyer or Flipper. 

Buy your next property with all cash, fix it up with cash, and then do a cash-out refinance afterward.

I have a number of lenders that I work with that will do up to 80% on a cash out refinance.