For initial setup, you’ll want the cable to have just a touch of slack, not overly taught. Shift into the big ring, then anchor the cable with just enough tension to lift the derailleur into place, aligning the outer plate about 1-3mm above the big chainring. Too much tension will prevent smooth shifting.
Secure the cable anchor bolt snug but not overly tight. Now you can make micro adjustments to the cable tension using the adjustment barrel. Shift through the gears and tweak until the transitions are crisp but not sluggish. Keep your high limit screw handy for fine tuning the range.
It’s a process of gradual refinements - tweak, test, repeat. Don’t rush it! Ride through all your gears methodically to ensure precision engagement on both up and downshifts. Get that sweet spot dialed in where the shifts glide effortlessly.
Installing a fresh cable and housing is also a great opportunity to check your housing length and use some quality cable lube. Those small details make a big difference for slick and reliable shifting performance.