Hi guys, I did a factory reset on my TV and that seems to have solved the latency issue :D
Now I have a new issue though :P which might be more connected to my setup rather than a general issue.
I added two more speakers for a 4.0 setup. Now I have two BeoLab 17 and two Harman Kardon Citation Surround. The Axiim Link does a great job converting Dolby Digital 5.1 to the correct speakers and I'm happy with that.
As one can expect when having mis-matching speaker models, the output levels between the B&O and the HK speakers are not equal. Luckily there is a setting in the Axiim Link app to change "per speaker volume". The problem is that, depending on if I change the volume via the TV remote or the Axiim Link app, I need to put different settings the the "per speaker volume".
When changing the volume via the TV remote I need to put +10 on the B&O's and -10 on the HK's. This is as far as the sliders go in the app and still it's not quite a perfect match.
When I change volume in the app, the corresponding settings need to be 0 on the B&O's and +4 on the HK's. This gives a better match in terms of volume between the speakers.
For me this means I can no longer use the TV remote to change volume, which is such a bummer because it is so much more cumbersome to open the app, wait for the connection and fiddle with the small slider (with is very inconveniently placed in the bottom of the screen where the iPhone app-switcher touch surface is, so you need to be really precise so you touch the slider and not accidentally switch apps).