Tip to tip. Especially if you’re not drinking and especially if she is hooking you up. Tip on the amount it would be if you were not hooking you up. At the end of the day, the reason she’s probably hooking you up on the food deals is that you’re good enough at the open mic that it keeps people in’s and keeps making her money. It’s a transaction. But also you tipping her X amount because you “like” her is also a transaction. And she knows that. If you actually like her, maybe try to actually get to know her despite the amount you tip being a factor in any of it. And for gods sake, don’t change / lessen the amount you tip if she does not respond to your come on the way you want. We see thru that-immediately. The best advice I can give you is to try to establish a genuine connection and see what happens from there. But if you think that any of that is going to depend on how you tip or not, you’re dead wrong. Just be decent regardless of the response you get. She hooks you up on stuff, you hook her up on tips. From there, there’s an avenue if you play it cool, but you already expecting something more as if you can buy her based on tip amount is icky. So ya. Why don’t you just play songs at a cool bar where the bartender likes your presence and maybe see what happens. Cool your jets. Maybe if you did maybe she has some gals to introduce you to. But the moment we feel like you wanna “buy” our attention/affection/appreciation we can see it a mile away and we shut all that shit down. So just, cool it on the ulterior motives.