Bump in the low mids, like old Lambdas (I think about my Lambda Signature), check. Lacking some excitment compared to Staxens, kinda german coldness in the mids, check. Sometimes biting in the highs in spite of flat high mids (Sennheiser tone for me), check. All around I pretty liked them, but there's indeed something a tiny bit too cold / distant compared to what may be a coloration from Staxens.
Don't completely agree with your assessment on soundstage though, but looks like you're a man of deep layered soundstages more than volumic ones.
Eager to see you daring tear them apart and hardcore modify them