@TheShipwright, @M_V many thanks guys, very much appreciated! So I've adjusted the cable and aligned the lines properly and voila! All gears were shifting perfectly during my 20mi test ride. Although today on my regular commute I started noticing that the 6th one is a bit odd. When you shift to it, it's fine as long as you pedal, but in-between pedalling you can feel there's something clipping. Other gears do it as well. I'm wondering If I just have to fine tune it a bit even if those lines are matching perfectly.