I have a fair number (more than 50) of honey locust trees plus some other hard hardwood type trees to cut down this summer. I've just found out that even green they tend to blunt chains very quickly. With a Dolmar 5100 what would be a good bar/chain combo to cut with? Also any specific bar or chain recommendations? The bar would probably be 16" max. I'm assuming a .325 bar would be better than 3/8ths bar to keep the speed up. But I'm not sure whether narrow-kerf would be better than standard (less power required but smaller cutters?). Also don't know if gauge would make a difference, even if anything other than .050 is available in .325. One supplier I looked at only have .325 .050 chain from Oregon and Carlton. What else should I be considering? I'd rather spend some money now to avoid many weekends of frustrating chain sharpening in a Kansas summer!!