Definitely avoid CF1s - they're absolutely horrendous in the wet, particularly straight line braking. I locked up in my sister's car and almost ploughed into a sign post whilst sharp braking from 30mph to 10mph after a light shower, when the road was still a bit greasy (with water), whilst trying to do a sharp right turn.
Night and day difference between T1-Rs and CF1s.
The problem which you've got with that tyre size is that the law of diminishing returns applies. There's only so much grip a 155 tyre can provide.