You saw Lady Milady, right? I've never met her, but from what I've read, I think she has a stronger squeeze than most ladies.
I think, if you're travelling, you should pick locations with more than one lady because it's easier to set up.
Also, what kind of lady do you like? I think Domique Danger is now retired, but she was a professional fighter and a large woman, close to 200 lbs, most of it muscle, but (I always worry when I say things like this), I never found her attractive, so I'd never considered sessioning with her.
You could contact the company Alphacats - people have written good reviews and Leona got plus reviews on her body scissor. You can probably set up several matches while there, and they can probably film them for you if you want, or no filming as you prefer. I have no idea of Leona does face sitting too, but with their cast of ladies, I'm sure some of them do.
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Likewise, Zweig could probably set you up with a few matches with his company fightpulse, again, filming or no filming as you prefer and he has a lot of nice ladies on hand. Rage is "all the rage" right now.
Rada gold also gets plus reviews for her crushing prowess.
You can't go wrong with London either. Scorpion and Goddess Thunder I think it is, are friends and can meet you together or separately. I'd look at London studies because a studio can make recommendations and they usually have a few women available.
In the US, people are writing interesting reviews on Bratty Fattie if you really want to be dominated. I think the European locations are generally better for meeting more than one woman. The US is more spread-out.
A lot of ladies, in my experience, don't really want to give guys a real beat down, and many don't like to do knockouts, or will let you go if you tap, not ignore taps, so when you have it narrowed down to some who you're thinking about, I'd ask again. Also, if you fly to a city to see one individual, scheduling and a cancellation can sometimes be a problem, so, for someone travelling, pick your ladies carefully.
I've only once had a lady cancel on me, but she had to cancel her trip and for me, it was just a 1 mile walk to her hotel across town. If you travel and pay all those expenses, cancellations would really suck, so when you have it narrowed down, I'd ask again with a list you've picked out.