VPN security setup advice ?

Ive setup a VPN on a 2860 router.

This is the first time ive setup a VPN and wondered if someone could look over my settings and advise if there is anything that could be done to make the connection more secure.

(Goes without saying all the passwords / keys are unique random generated strings, but wondered if anything could be changed in the settings to make it more secure).

Ive posted a redacted version of the setup page here : https://imgur.com/a/5f1ak