10 and 10 are not big jumps. The shifting aids on modern chainrings are designed to aid things like 16 tooth jumps, and mostly for upshifting (pins, ramps), but also downshifting (gates, i.e., reduced tooth height) for doing so under higher chain tension than in the past. Way back when, derailleurs were all designed for road bikes. Downshifting while climbing steeps on a mountain bike requires a stronger push. My Microshift 9 speed triple FD which I retrofit for 2X on my folder, the spring is *ridiculously* strong, my hands were not strong enough to use the left gripshift, I had to fit a lever/trigger, and even then I need to push with right thumb inline of pressure, not left thumb swinging an arc. This is WAY stronger spring than I need for downshifting, but it was probably designed for mountain climbs and muck. I only bike on road. The Microshift is the only one that fits my FD adaptor design, Shimano didn't, linkage interferes, I'm still looking for one with softer spring.