the problem is most likelt two fold.

1) capricorn tubing is really tight tolearance, it's it;s point really.

2) the path of the bowden tube on the creality i3 printers is bloody awful.
When it's at the left side the angles the filament has to push through are too tight. And without tyhe little slcak you get with standard 2mm internal diameter tubing, the extruder just doesn't have the guts to push the filament round the bends.

What you need to do is to fit a right sdie z-screw and the move the extruder to sit on top the hotend and convert to direct drive. Then fit a top mounted filament holder. That will solve 90% of ender 3 printing issues.