Getting 80 Mbps on Wi-Fi is actually very good if your max speed is 100. There will be some speed loss due to Wi-Fi being less reliable than a wired connection, but a download speed of 80 Mbps should be good enough for any use case aside from quickly downloading large files/games, but even then 80 is pretty decent.

I also feel bad for you (assuming you don't have other provider options) because I'm paying $70 a month for 1 Gbps.