Alright, original poster of advice here.
Not even thought-forms will work in your favor for longer than 2 weeks. (Most of them. occasionally you can make a loyal one)
Demons are like astral con-men. always out for something. (There are some OK ones. Ex: I once ran into a friendly succubus.)
Powerful thought forms?
Like a persona?
Or a tulpa?
Demons are the easiest summons ever, common demons that is. If you try to contract with them, they play hard to get. But they want to grab you, so you really don't even need to summon.
The thing you are talking about, pitting demon against demon, sounds more like a video game than summoning. If I were you, I'd not worry about the fact that you are noticing the boys more than the girls and just go with it.
Demon summoning is like paralegal work with your soul on the line. It's not like taking up a hobby or smoking dope. You mess up, just a little, and before you know it you're in too deep. My suggestion is if you are turning to forechin for help in learning to summon, leave it alone.