I'm pretty sure that the reason that 1x1 is it's own sub-forum is because on the old site they were getting lost in the mix of all the groups. Now I know that this forum is set up differently than the old one in terms of how sub-forums work. But I honestly think I'm still going to like having it done this way. I'm a 1x1 Rper AND a small group Rper, though I prefer the former. I personally write on average like High Casual, but I can easily do fully Advanced as well (or fully Casual, whatever works with the story or my partner). I don't like the idea of me having to go to two different forums to find the kind of people I want to write with. 

I liked the old tag system on the old site and honestly thought it was working pretty well. But I mostly click on Interest Check threads by their subject than by their level (though I do avoid Free or Free/Casual). A lot of Rpers don't know where they're at, no matter if they're 1x1 or Group players. I found that I was more Advanced than Casual by clicking on a thread that had an interesting idea in the subject and then said that it was more Advanced than I was doing. But I gave it a go and hey, guess what, I [i]am[/i] an Advanced writer. I probably wouldn't have looked at it at the time if it had been labelled Advanced right up front. And I would have missed it totally if it was in a purely Advanced forum. 

So I think that if you separate them based on level, that you could miss out on writers who are Advanced who don't know it by limiting them seeing things. Tags are the best system to use by just looking at titles. Though really, what you should do in the OP of any interest check is put what you're looking for, explicitly. Like how much you write, how much you look for in a partner's writing, ask for a sample (especially since you can't go back and look through their old threads atm). Separation isn't really needed in my opinion.