Sorry, I do not know how far is the tonearm tube from parallel to record ... I have not chechek.
What I will do is the following:
1/ To check my prephono Sunilda with my friend's turntable (which is well adjusted as he own very good arm). If I have strong basses, it will mean my Sunilda is OK. Otherwise, I will contact AudioValve and s what i can do.
2/ If Sunilda is OK (this is what I would prefer), I will purchase a VAT adjustment system (available for Reaga arms ..) and I will change it.
My feeling is that this is a VAT issue, as the rest of the sound is really nice ....
Curious? I am fom France .. in Grenoble.
Regards to all