Probably worth taking the strings off, removing the truss rod nut, grease the internal threads with some vaseline or machinist wax and either move to low tension strings or round core strings.
- That is if you want the bass to serve you well for the next however many years & to keep it within adjustment.
Dunlops may be worth looking into, if not I’d recommend Tapewounds/Low tension flexible flats from La Bella, if rounds are your thing DR do some great Round core low tension rounds.
Hex core strings like D’addario, Ernie Ball etc always tend to be quite a tension on the neck, especially with 5 and 6 string basses.
This has always been a problem to me, which is why nowadays I won’t buy a bass without neck reinforcements, because the amount of tension on a bass neck determined not only by string gauge but the core & materials can be a massive strain on the wood, especially when travelling and leaving your bass in tune.
Id recommend to keep your Maruszczyk in tip top service moving to something lower tension, not necessarily a lower gauge 😊