How many jubilee clips are you up now and how's it going with those ?
I have used three, but have now started fine tuning one of them to get it where it makes the least vibration. I just move a few mm each day. At a point now where i can sit from 100kmh to 110kmh and it well be completely gone for maybe a few mins, then comes back very slightly and goes away again. Its going in and out not on speed or acceleration, but on its relation to the other drive shaft. So i go on a slight corner or change lanes, this can be enough to bring the vibration back.
The left drive shaft on mine is the main cause, the right far less, so i dont have a clip on that side yet. I am just about ready to start tuning that side. However, i dont expect it to completely go.
I still believe balance and poor precision of the shafts are the cause. Ive had cheap knock off drive shafts in my subaru, and i found a number of forums where others had same issue, got the mech to put new OEMs in, and we made a bet, if it fixes he pays the difference. And so he did
The precision of the shaft length is key , the shaft can be perfectly balanced and you will still get vibes when putting down the power. (not the sentence you want to walk in on )
What i have found, eco mode and cruise yield the least vibrations. So the front motor engagement enhances vibrations big time. However some times you can be in sport and experience no vibes even on the power, but rarely.
I am also slightly open to this being a combination of shafts, engine mounts, balance of front motor gear internals.
I have noticed driving around, this car feeds vibrations from the road back into the chassis in a weird way, combo of stiffer springs and roll bars ?
I have been tempted to try 225/50r18s, giving a higher sidewall. Also these crap fake Bridgestones are probably only having the same contact patch as a 225 or 215, they are very round and run a high psi. And in the wet, i step the back out all the time, fun but annoying. Oh and have a go on the brakes in the wet, absolute rubbish. Dropping pressure helps but alarms do my head in.