I'm in the middle of routing Hickory raised panels for my kitchen and am on pass 3 of 5 with a Summerfield horizontal raised panel bit. I am getting a lot of fuzz on the end cuts and generally feel like the bit is in need of sharpening as I am getting more chip out than I would like. I've had the bits about 8 years and have done about 50 panels to date in Oak, Hickory and MDF. How often do they need sharpening and how do you normally do it, touch up with a diamond file or send them out to a sharpening service? We wouldn't think of sharpening our own carbide saw blades, but I would be nervous sending them out not knowing how well they will do it and will they end up changing the profile?