Currently enjoying the 4+2, I thought that with the 2 x 8 mm drivers I would encountered a strong bass, I have dealt with multiple DD IEM's from Lear and UM and had mixed feelings.
Early thoughts using stock large tips and cable
No doubt, if you are listening without knowing the specs, you will know it's a hybrid as the DD show it's presence but it doesn't feels like a 8 mm driver, but almost like having a 10 MM driver and not like 13.6 mm as some other hybrids .
So I think the 2 x 8 mm is quite good in providing the right hit in the bass region. For example Big Boi Kill Jill sounds fantastic with the hits that occur within the first minute or in Big Sean Harder than My Demons changes during the first part of the song
Still listening on the Mids and Highs using Interpol, The Smits and Sault. The BA approach seems very good, no fatigue or harshness.
No doubt need to keep listening
Cable and accessories very good