Most landlords in Lawrence township now take evictions through Superior court, although that has added costs and is a slower process.  

I could also just do RUBS on each of the 4 units based on # of occupants or square footage or another method (which is best???).

Cash for keys is definitely the best way to get people out in the day when I was very active at court houses steps cash for keys was by far the best way to get folks to move and bad tenants in a state with bad eviction laws to me would be the preferred method. you simply pay them when they are leaving the house not before.. that works fine and you give them more than 1k .. you make it worth their while..

Does anyone have any tips on how to find the right guys or methods that you use to vet people? 

Well, not long ago somebody made a post about BRRR not being a good method at this point. 

What other methods should I use to acquire another property? 

BUT WAIT, there's more:  Then when I hit submit, I got a message "your payment method has been removed successfully. 

Under this method each investor has ownership and voting rights.

Another great option is the BRRRR method (Buy, Rehab, Rent, Refinance, Repeat), where you buy a fixer-upper, renovate it, rent it out, and refinance to pull your cash back for the next deal, and this is a good route because most private lenders can go higher LTV than on a rental loan! 

BRRRR method is also a great way to go - good luck!