Hello,
I'm sorry if that was unclear, but at the moment there are no different CIRC movements supported.
We would need to integrate that specifically, which takes time.
For now what you could do is simply to split your 270 degrees circle into two 135 degrees circles, I guess then it should work as you want it., with the tip keeping the orientation towards the middle.
Personally I'm not a huge fan of either CIRC or SPL, usually I try to use properly spaced LIN commands with good interpolation parameters.
Best,
Johannes