Don't you think it would be better to first do a lot of shooting with it and monitor the muzzle velocity every now and then? The standard FX impact regulators already allow a very tight extreme spread so replacing it for that reason makes no sense. When the regulator starts to fail you can still make the choice whether you want a HuMa or a replacement FX regulator. Also the regulators in the impact X are more robust than the ones that were used in the previous version of the impact (except the last series of regular impacts)
Immediatelly swapping regulators when buying a new gun only makes sense if you know what you want to achieve. Like for example in the wildcat you can achieve a bigger plenum with a HuMa than with the original FX version and if you know what to do you get different tuning capabilities. In the impact this is not the case because the plenum stays the same size.
Therefore my recommendation: start shooting, and I mean a lot of shooting, check the muzzle velocity regularly and do proper maintenance in time. This will keep your impact in perfect shape and always ready for use.