My bike is outfitted with the Sora FD, total POS that I should likely replace but wanted to see if any of you might know some trick I could use...
Here is the issue. Any time that I swap from the small to large crank ring, I get a chain rub on the FD. I took it to the LBS and they did some adjustments, moved the FD down a little, and put in a barrel adjuster next to the brifter so I could adjust it out on the fly.
Just about every time I swap I get the rub. I can adjust it out and the next time I switch gears it starts again. If I go down to the small and back up, w/o changing the rear gear it gives me about a 50/50% chance of not doing it, but if I change the rear gear at all it will rub on the FD on the tall gear.
My brifter is also Sora and is made to be double or triple. The LBS did some adjustment on it so that it skips over one of the stops, or something (not sure) but I only get one click going up, but still get two going down if I press the button lightly enough. At times I am able to adjust out the rub simply by pulling or pressing the lever or button, but not always. Even with the barrel adjuster I cannot find a happy place for it to be and not rub on the last three cogs of the (rear) sprocket.

My thoughts are that the Sora FD is just not stiff enough and is actually flexing causing the adjustment "issue". Another thought, and I don't even know if this is possible...but since the Sora brifter is made to be triple/double, is the spacing of the index actually a little off from the compact Tiagra chainring that I have put on?
I replace the Bontrager Sport cranks with them, the rub previous to this time was being caused by crank flex that I could actually see. Now, IDK.

Any suggestions or reading on how to fix this issue? Replace part(s), adjustment, w/e?
Thanks ahead of time for any help you could offer.