Well first off, any guy calling himself "straight acting" is a big ole queer.
Neither you, nor any guy calling himself that is acting like a straight guy. Straight guys don't fuck other guys, which kinda disqualifies you and anyone else wanting cock.
After all "straight acting," is just drag of a different color, affectation and posturing intended to project a persona.
What you mean is that you don't think you're effeminate, and want nothing to do with effeminate guys. Which of course has nothing to do with how straight guys actually act.
So, yeah, been there, said that, had the issues, the problem is that you will probably not be attracted to any guy who actually says he's into guys no matter how butch he is. Kinda goes with the territory, it's far too gay to actually admit it. You're probably looking for a way to have your straight guy and fuck him too.
Like I said, I understand, I've been there. I know the terrain.
No matter what we in the community of guys who actually fuck guys want to believe, you don't have a shot in hell with most straight guys, just ask them, they'll be happy to tell you. Either because of 'phobic culture, or personal disinclination, and there is no set of behaviors that exist that will give you a definitive answer about which ones are willing, and which are not (short of dropping your jock, and sucking your cock.) That's life, that's just the way it is.
EXCEPT, grabbing your fucking scrotum and asking - but then you hit your problem, if the guy is actually willing to admit he's gay, he's probably not what you're looking for is he.
There are plenty of butch guys out there who are big ole' queers, they'll tell you, they'll hit on you, they'll buy you a beer. That's how you get a definitive answer.
The rest is just about how big your fucking balls are and if you're willing to gamble or not.
Yes, you can ask a guy if hes gay/bi, I've done that, a lot, yes you will get an answer, you just have to have the courage to take that risk.
But I suspect you'll never do that, which is why you are in here trying to find a set of rules to differentiate which guys are in straight drag and which guys are straight.
We've all been there, wishing there was a way to tell the gay ones from the straight ones, without having to take any personal risks, it's a hugely common fantasy - and you know what, there is a way, you go find the guys who will tell you they like to fuck guys. With them, there's no ambiguity at all, no matter how butch, or fey they might be.
Now before you get all indignant, consider this, what you're saying and how you're saying it is very familiar to a lot of us, we've lived it. A lot of us have been where you are and said what you're saying.
Most of us have worked through that and figured out that there is no point in wasting your time on ambiguity fueled by issues, and that's what you've got, an issue about your masculinity and how that relates to wanting to fuck a guy.
If you can get rid of that, you options will expand exponentially, because you'll go out of your way to find guys who overtly want what you do, and you'll stop trying to find ways to fish in a dry pond.