I think the issue here is perhaps the understanding of your “problem”. I use Ableton Live (8&9), Sonar, Cubase and dabble with Reaper even.
One is able to trim and cut a loop, to loop perfectly in any one of these programs, but the way in which this happens differs from prgm to prgm.
Ableton’s strength is the simply way in which hit/warp points are generated and used. Cubase has many more points per section of audio and is more complex (visually).
One has to spend some time tweaking the warp points to achieve the same outcome as Ableton - however Cubase has a lot more flexibility, which may or may not be appreciated…