If you strategy is to build a rental portfolio as fast as you can then, you want to refinance at the highest available leverage. (75%) That allows you to preserve your capital so you have down payment money for your next deal.

If you plan to keep investing than preserve your cash for a future purchase opportunity.

But at the same time, the expected cash flows from these DST's are a bit low....so although I'd be preserving a substantial amount of capital, my cash flow would still be lower than if I were to take the tax hit and invest the money elsewhere.

The more you know about building and preserving wealth, the path becomes very clear.  

I live about 5 min north, up by Robinson Preserve. 

Depending on how long you plan to keep the properties i would suggest laying LVP overtop the hardwoods and preserving them, which you can easily remove when you go to sell down the road...

This is at 280k, with 5% down conventional. 5% down because I want to preserve capital.SFH, not multi-unit.

And it would preserve their step up in basis. 

In the meantime, store yours and preserve them.

Everyone should do regular maintenance to preserve the value of their property, whether that's you as the owner or the property manager.