This is my first investment property in a C class neighborhood, and I thought I had some good tenants, but there have been 3 late payments for rent in the 5 months they have been leasing my rental.  

Condos are sometimes not the best long term wealth generators depending on the location.I am assuming you went with a condo because it is what you could afford in the neighborhood where you want to live. 

signs at pawn shops in Texas.

Also, see what other rental listings look like in your neighborhood.

If they don't actually own anything here, it's likely they will tell you advice that just doesn't really apply to the market or they won't understand which neighborhoods are what (neighborhood grades and street by street as they change).

It has a slightly more vacation-friendly vibe with its arts scene, annual events, and outdoor activities that draw visitors regularly.Since you're targeting STR occupancy over 50% without extreme seasonal dips, you might consider neighborhoods near popular attractions, like Tulsa’s Downtown Arts District or the lake areas nearby, which offer steady, diverse visitor interest.

Have you checked out your competition in the neighborhood to see what their places look like, and what amenities they offer?

Worst neighborhood on the West.

My buybox is <150k, as turnkey as possible, 3 bed, prefer 2 bath but will do 1 bath for the right deal, neighborhoods with lower crimes than the nearby areas, rent at <1.5k.

Try looking into zillow/Redfin and see what your potential rents you can get near the neighborhood by filtering the bedrooms/bathrooms of the intentional property that you are planning to buy.