I've recently started an eviction on a S8 tenant of mine in Detroit.The process will be identical to a normal, cash paying tenant with one big exception.The housing authority will continue to pay the voucher amount during the eviction process. 

For the other portion, invest how you see fit really.You can try accelerating some purchases that you would normally do next year to be this year, but there's not a ton outside of the normal stuff.

I normally sign up for a year lease.

This will increase their normal business.Get a liquor license, sell cocktails, Sangria and summer drinks (no wine, leave that for the restaurant) from 9 to closing time from the small location. 

Now it is a more normal market or even a bit depressed as we are arguably in recession.

With the Essentials (which are only $2500), it teaches how to save $100,000 in interest on a $200,000 house with no extra money put into your budget and without changing your lifestyle.

The normal return would generally be quite a bit more than you're making now. 

Regarding a refinance on a sub2, are there any special conditions or is it straight forward like a normal refinance?

You can do a balance transfer right into your bank account, they normally charge you a 2% -3% upfront fee and give you 9 - 12 months 0%.

I do not know your tax situation, but I know most tax professionals are fairly busy and normally do not guarantee they will be able to file by the original timeline.