when i use this yeast, it does krausen, but only in primary. my starters don't hardly foam at all.
expect the krausen to linger, and form a 'skin' over the finished beer in primary.
And yes, you need kolsch yeast to make it a kolsch. I think your starter is doing fine.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10