I have a stihl fs80r which I love and an Echo pas 230 with a trimmer head on it. The echo seems to scalp the grass much easier than the stihl does. Is the echo pas 230 underpowered for a trimmer? I love my other echo products, but I'm not a big fan of this trimmer. Should I try the SRM 311 which has a lot more power or buy another stihl?