I'd say the wiz int solo is only good if you have an almost lagless connection+ very good pet control. Otherwise, you might feel frustrated with wizards or archers juggling you in a corner with their ranged skills.
Stones of Sliab is only worth it if you have a good duo lvling partner willing to take a seperete route and meet at golem. I can solo this but the golem at the end takes a bit too much time even if I have enough crit to critical it 30% of the time.
With that said, most of the time I'm restricted to soloing Shadow Warrior Hard. Maybe moving to Tara if the zombie mission is more efficient in kill speed/exp/risk.
Sometimes, there's a organized group run for Shadow Wiz adv/hard that can complete the whole sms in 20-30ish mins and I join them when I get bored of soloing.