You are completely missing the essence/fun of punting, if you are just staying with safe regulars. By your very admission, they are just 'hmmmmm'. Get out there and TOFTT. You may well end up disappointed, but you will at least get the adrenaline rush as the door is opened, which is more than you are getting now.
Everyone wants something different out of punting. I doubt I have ever got much of an adrenaline buzz as the door is opened, more a dread of what I am going to find. I used to get quite a buzz from the build up to seeing a girl that I have fantasised about, but experience has taught me that is a sure road to disappointment. No girl ever lives up to the fantasy.
I measure my punts by whether or not I leave with the feeling that was a waste of time and money, or if I look back with a spring in my step. I have a number of SPs that I see regularly, depending on their availability, who I can be reasonably confident I will leave having enjoyed my time with them. I do agree that seeing someone regularly who only gives you a hmmm feeling sounds like settling for second best. I would be casting my net wider for something better than that.
If none of my regulars are available, and noone on my to-do list, I will take a lucky dip at one of the Chinese switch joints. Have had an unexpectedly high success rate at such joints lately. And in response to a previous poster, some of those successes have been with girls who have had very limited English, and have needed to use a translate app. In my experience, all SPs understand the basics (suck, condom, sex, doggy, massage, etc) - what kind of rapport you get is more about how you treat each other than what you say.
So my punting success rate is very high, as most of my punts are with regulars (I am not going to make up some ridiculous percentage estimate). My success rate with girls I have not seen before is significantly lower, which is why I tend to stick with my regulars.
However, my approach these days is tempered by the fact that I now live in a punting desert, and have to travel a long way to somewhere with reasonable punting opportunities, usually involving me staying overnight in a hotel. So if a punt is a wipe out, I will have wasted significant time and money. Which probably makes me more risk averse than most.