I would never top an auto! Unless it was an accidental topping (lol aka my Santa) lst'ing would be much more benificial and does the same basic thing as topping, your promoting exon production for the plant will force lower shoots to raise towards the light. Topping is great for photos as they have time they can recover.
I can say as much as I was not trying to top my Santa, I was trying to lst and main top snapped off which actually has caused the rest of the plant to start stretching.
Though I suppose your 3-4oz pull speaks for it self... Next time, lst I bet you get 4-5 ounces

Congrats on the great pull!