I've read that the upgraded 'bumphukkit' bracket that allows for maximum pressure without foregoing flexibilty, can be unsafe at speeds of less than Mach 2.''
MWB... please refer me to where you read that... as I think its a phallacy: the '40' model is perfectly capable of Mach 2... 'however'... the Antipodean models were recognised as having a design fault and can be put under severe strain at these kind of speeds...
I therefore recommend you replace your '40' with the very popular '69'...