My wizards at low levels pretty much do the same thing try to hold or disable the mobs the party is facing as best as I can. Youd be surprized how spells like hypnotism helps in quests like ww. You get those Kobolds standing still and have the melee's pick them off. I noticed you also said you use web a very good spell even after the change to it.
one thing I noticed you said you like fireball which is good but remember do not web and fireball its a waste fireball will dissolve the web. web does work with scorching ray though. Once you are running deleras you may want to try the halt undead/fireball combo it is a lot of fun keeping those deadies still
My wizards now focus on crowd control like fogs/webs/ck but they can also insta kill help wf with repairs and I love the force spells even though its magic missle/force missle right now they pack a real wallop when you spec yourself for it.
Also at later levels debuffs can be your friend and get you more recognition in a party. Ray of exaustion, Waves of fatigue, waves of exaustion, ray of enfeebling, bestow curse, mind fog, touch of idiocy all those spells can be very good to a wizard and very bad to an enemy. The cool thing about being a wizard is you can pretty much test spells and find what you like to do.

I hope you enjoy the class I know I do.