I completely agree your suggested buffs/nerfs to goblinstein, pekka, and wizard.
Goblinstein’s problem is the ability not the hp. The ability is like a two elixer poison that can have much higher range. The monster actually need a decent hp to reach the tower and launch the ability, otherwise, the card is not good. The ability damage is the problem.
Pekka, your suggested buff is what I completely believe and agree that pekka needs to be balanced, as pekka is underperforming now.
Wizard/evo wizard, I also completely agree. Evo wizard need the buff to be a decent evo, as now evo wizard is almost no big difference than wizard. The evo should be a big difference from the regular wizard. And the regular wizard need an hp buff, it is the worst card in terms of stats (specifically hp) for his high elixer cost. Both wizard and evo wizard need a buff, wizard have been bad for years and he is now overshadowed by all other splasg units. These buffs will make him balanced but not broken especially on top ladder where wizard is not relevant.