Hi all. From the outset, please note this may not work for everyone but has certainly worked for me and a few others I've asked to test. Let us know in the comments how it went for you. Read this article on Whirlpool so gave it a go. Previously getting 46/17Mbps on Speedtest but now getting 54/18Mbps after a modem power cycle. Not sure what the '15% overprovisioning' really means, so I'll let the experts comment below. This article has a lot more information. Hope it works for you. Stay safe, and enjoy :)
Edit: Telstra announcement.
Mod Note: This is not specific to Telstra, the deal is just linked to a Speedtest hosted by Telstra.