I have a Husky 340 with a 16 inch bar and a factory chain (Oregon backup). I know that after each tank of gas, I'm supposed to touch up the chain (I use a with a Dremel attachment). I spend approx. 3 seconds on each tooth (about 4 strokes) on high. Here's my question: After about 2 sharpenings (2 tanks of gas) the chain starts to dull almost immediately. It takes approx. 2-3 logs, and I'm blowing dust again. Yes, I'm sure it's the right diameter Dremel attachment, and no, I'm not hitting sand/dirt. I get it machined, and it's awesome for about 2 more filings with the Dremel. So... am I filing too much myself? Not enough? Should I stop using the Dremel? Get it machined each time? Thoughts?