I have used WB-06 a few time but am not fond of the strain. It is more tart to me than anything and very one dimensional. I also enjoy my hefeweizens to be very "clovy" so I normally employ a ferulic acid rest at around 111.
I have brewed a lot of kolsches and I brew alt very regularly (probably once every 2 or 3 weeks) and if you ferment these strains too warm or don't pitch enough yeast you can get some over the top esters. I try an keep my alt and kolsch down in the very low 60's, usually pitching around 58 and they come out pretty clean.