Originally Posted by mechBgon

Ok, two things to start with:

1. when you sit on the bike, the suspension squats and will change the effective approach of the chain, bringing it through the FD higher. Notice how the outer plate of the FD has a "kick-down" step stamped into it... well, if you're on the small cogs in the rear, the chain may actually be coming in below that step until the bike squats. So verify your shifting setup with a test ride, it can change how a suspension bike shifts.

2. corrolary to #1 there... it's not common to be using the smallest cogs in the rear, and then try to punch down to the granny ring in the front. That's like shifting your pickup truck into 5th gear and then dropping the transfer case to LOW. I mean, technically it would be nice for it to work when demanded, but in your real-world usage pattern...? Not very likely you'd do that one except by accident. So I would a) verify the FD height and alignment respective to the chainrings, b) set the lowgear limit screw for slight clearance in low-low, c) adjust the cable to achieve slight-to-none clearance in middle-ring/largest-cog, and d) adjust the highgear limit screw for slight clearance in big-ring/smallest-cog.