Really bad 'jail bars' (vertical lines) on my console - any ideas how I can fix it?

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I'm currently using a Model 1 PAL Mega Drive with a 60Hz/NTSC switch mod into a C-Sync RGB Scart cable from Retro Computer Shack...
https://www.retrocomputershack.com/
This then feeds into a RetroTink 2X and out via HDMI into a 4K LG television. Yes, I know modern LCDs aren't ideal for retro gaming; I don't want to rehash that argument.
Unfortunately, I'm getting pretty bad 'jail bars' - aka pronounced vertical banding on block colours, e.g. the blue sky in Sonic The Hedgehog's Green Hill Zone. See the image below for an example...
https://farm7.static.flickr.com/6021/60 ... 2de5_b.jpg
Some have suggested my cables could be to blame. Would upgrading to a different brand of RGB Scart improve things? Please don't recommend the HD Retrovision component cables; I know they're fantastic but, as I'm using a RetroTink 2X Scart in my setup, my cables have to match.
Right now, I'm looking at Pack-a-Punch as they seem very reasonably priced...
https://www.retrogamingcables.co.uk/seg ... -pro-build
But are there better cables available elsewhere? Or will no cable help to mitigate the problem?
Whilst I've heard that the triple bypass mod is a surefire way to solve the issue, I'm unfortunately not capable enough at soldering and electrical work to even dare attempting it. Are there any alternative fixes I might try?
If anyone here is based in the UK, do you know where I might buy a pre-modded console with the triple bypass mod installed?

submitted by /u/DeusBex
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