a picture says more than a thousand words.
This what my puck looks like on my Elektra A3 after extraction. Medium to heavy channeling and inconsistent shots.
My skills are fairly good. My old Gaggia classic delivered good and consistent shots at my barista level.

I have a in-line water pressure regulator set to 2 bar and have also tried different dosing and grinder settings. Over dosing is obviously not a good idea on the Elektra...
Any idea how to solve this?

Clean your machine. Take the shower screen off and the brass dispersion block. Soak it in JoeGlo, give it a scrub with a brillow pad or green scrubby then take a sewing pin and poke it through each of the holes in the dispersion block. Then let it soak for another half hour and run the pin through the holes again, rinse and reassemble. Bet you will get better results. Those little divots around the puck are a tale tale sign. The holes in the dispersion block are partially plugged and instead of raining water it is squirting it. You could try dropping your dose about a half gram as well but I would clean it first then try a shot, then try dropping it a half gram to a gram and pull another shot.

It is quite clean, just recently cleaned it. But there is no problem taking another go.
I will return in a short while to inform you on the progress (or lack of).
Hopefully be able to back it up with pictures and video clips...

No success. Looks even worse this time.
Have to have a naked portafilter to draw good conclusions, as well as a manometer.

Even if you do not have a bottomless, shoot a video of your technique - it may help figure out what's going on.

Your elektra is a heat exchanger, are you flushing before the shot?

Yup, doing the dance.
Just looked around at shower screens. seems like mine has too few holes, this could cause all the fuzz, since the dispersion block give of water jets...
I can imagine having the holes in the dispersion block offset with the holes in the shower screen could help a lot.

Any Elektra owner that could confirm that the holes are offset i.e. you can't see through when the dispersion block and shower screen are put together?
I might just have bought the wrong shower screen.
See ugly paint illustration...

Have you tried playing with your tamp pressure? I've found that a light tamp seems to reduce channeling. This is not on my Elektra though, but on the Valentina which is still an E61.

Any updates on the channeling problem? I have had dispersion issues with my A3 from day 1, and have never been able to solve the issues across numerous grinders, blends, techniques etc.

Grant