I just upgraded my mainsheet from 1:6 to 1:7 and it does make a difference. However I have also tapered my mainsheet before that and that made a bigger difference. Now I have both and I think I will stay at that. To be precise I used a swiftcord hollow line as mantle and ran a 3 mm dyneema (spectra ?) line as core through it. Only partly. Than I stitched it and tapered it. Now I have 500 kg high tensile and flexible 3 mm line running through my blocks and a 8 to 9 mm soft comfortable section that runs over the ratchet and that you hold on you hand. I'm pretty happy with that.

You may want to consider going the same way it.

Also I do cleat the main when conditions allow. I prefer a crew working the mainsheet and hold the traveller line as a safety.

WOuter