But im thinking that adding 150k to the total would likely not be enticing enough as a offer for someone to trade 25% down on. to get an extra 150k on the loan sum.

Home Warranty, Closing Costs ($5k), and Inspection paid for by Seller if closed to entice first time buyer as they will have almost zero out of pocket except for down payment and a bit of escrow.

I say this because in order to entice a flipper, you are going to need to have something to offer as well.

What else can I add to this offer to make it more enticing to the seller? 

This is especially enticing since the rate is so low.

Also, purchasing in December when you had the ability to negotiate made it enticing.

New Braunfels is expecially enticing since it sits between Austin and San Antonio.

This is a great question.I think that the $544k will be more enticing to the seller because for some reason, sellers have a specific number that they want to sell the property for, so if you give them the number they want, it looks more appealing for them because they feel like "they won".

Medium-term rentals seem particularly enticing having just stayed in furnished rentals throughout our travels since 2020.  

@Tyler Mutch  Yeah, I believe that "depending on your exit strategy" would be a pertinent point because If you plan to hold every property for 30 years, that wouldn't really be enticing to the Realtor. :)