I have a over grown yard weed cleanup in a few weeks and the few I did last year with my Echo 230 with the standard string line did not work all that well with heavier stalks. What do the experts recommend here for heavier weeds? I know a beefier trimmer is better but how can I speed up the process with the 230? Metal cutting wheels etc.? What works better and what not to waste my $ on. Any input?