Leaptel FTTP 1000/250 plan - only getting ~200mbps down

NBN finally finished installing our FTTP after 2 weeks and 3 visits.

Service is activated via leaptel, using IPoE with an ASUS RT-AX55 router.

Speedtest results are consistently showing around 200-250mbps instead of the advertised 800mbps expected for the 1000mbps plan.

Leaptel customer service said it could be because the service was only just activated so it could still be "warming up".

Any ideas what the cause could be or is this just as good as we can get?