I dump all rental money back in to paying off the loans to generate more free cash flow.

Is there any way to get the property to appraise at a contrived value proportionate to how much income its generating?

Craigslist is what I used to build my buyers list, but I wasn’t sure if it was an outdated lead generation source.

You can't just make a blanket statement and say LTR's are safer in every market, and STR's will generate more revenue that a LTR in every market, etc..   

You should always be doing lead generation as a wholesaler.

However, you have very little risk now compared with what you'd have to take on to do so.If you are willing to let your timeframe slip, the properties you do own will likely appreciate further and continue to generate more cash flow.

Also, was this a rental in the past that generated foreign tax credits?

There is no need to generate some list, and hope that it is a good one.

For example a i have an investor client who we searched for the right property for about 9 months but once we did find it now he is generating $2,000 positive cash flow each month which is amazing. 

The property generates $2600/month right now, and conservatively will generate at least $4000/month when full rented.