I suspect that as with all lager yeast you need a tad bit more yeast; Did you make a Starter? And, was it bit enough. If the yeast is stressed; they can through off esters.
I did a Cal Common LME Extract with one Tube of White Labs San-Fran yeast back in the day, and it finished out a bit sweat and fruity.
~ BIAB : All Grain Made Easy ; Mash, Sparge, Boil all in the same Kettle ~ all you need is a bag and a hook!