As others have mentioned, your numbers look fine for Channels, assuming they hold up reliably.
If you still want more bandwidth over wifi: I'd make sure your router supports the 5GHz band and that your devices are connected on the 5GHz band if they are capable of doing so. You may have to enable band steering (unfortunately and confusingly, different router brands have different names for this). If that feature is not supported (only newish, high-end routers tend to have it), you will have to put your 5GHz network on a separate network SSID and reconfigure your capable devices to connect to that new SSID.
The 5GHz band is less congested, and is more readily capable of supporting higher radio bandwidths (40, 80, or even 160MHz) than 2.4GHz (which is usually limited to 20MHz, although you might be able to get 40MHz if you don't live near any other wifi networks). In addition, 802.11ac only works over 5GHz, not 2.4GHz.
Note that 5GHz has less range than 2.4GHz. This is good because it means it's less congested, but bad if you live in a large and/or particularly RF-hostile house (depends on how it's built). So your mileage may vary.