Only done the flyaways during OPCs when our weight is typically around 2600kgs(max 2910), so probably better performance that when at the max.
Yes, we have helipad capabilty at MAUM(+17 C at S/L). The TDP for Cat A(Perf 1) is 120ft, and, again at OPC weights, there is very little height loss. Even so we can flyaway without having to use the 30 second rating, so it's possible that using that at MAUM the performance could be similar. Then again, maybe not.