I have done the same with the .043 to .050 swapI am not a fan of the tri-link chain. Cutters are fairly soft and leaves a burr when sharpening and dulls quickly. The one offshore chain that seems pretty good i have used is Archer. I have never liked the .043 LP stuff. Just dulls too fast on hard wood and gums up quickly on pine. On my MS170 i swapped out the 043 with 050 bar and chain. Huge difference.