This is a new DOB we're talking about, is it not? To start with, do these DOBs have lock screws? My Meade doesn't.( just heavy springs). Anyone? Correct info. here please. If so, then I would back them off completely, then tighten the collimation screws right down CAREFULLY & SLOWLY, in turn, till they 'bottom out'. Then give each one 2 to 3 turns out, ie; loosen, collimating as you go. When done, just nip the lock screws up a 'little' more than finger tight. Not too much. This way, you have max tension on your springs.
Am open to correction. But this works fine with mine. Haven't needed to collimate for 18 mths or more, only after cleaning.
HTH.
L.