idk if fps_max has any effect, but normally you should set it to 500 or so, also, do you have -condebug enabled or any of that sort? could cause it too, also, try without M9K or some sort of that.
Alternative you also could try EVEN LOWER tickrate, like 22.
Maybe its also an DDoS/Hoster overload? Are you hosting it on a private VPS, or using a server provider? If yes, wich provider? Tried contacting them of overloading? Because of your 240 ping. You alternative could try booting without addons, maybe one of the addons is badly coded/unoptimized, wich uses many hooks/functions/often contacts a database/webserver?
Because from what I can see, something sends a really high amount of net-/usermessages, so it seems an addon is causing problems.