After replacing a bottom bracket with square taper I repeatedly have to tighten the screws that fix the crankset (on each side) to the bottom bracket axle or otherwise I can feel sometimes a slight movement of the crankset on the axle. I understand that this might be needed once or twice for parts to really settle in but I wonder how common that is or wether there are tricks to avoid it. This is an old Shimano crankset and a new Shimano bottom bracket. Since the screws are not very long (about 10mm of thread) I also fear I could damaging them in the process.