Ahh bugger! Maybe a higher diastase base malt would be better with that amount of oats?
Or if you don't want to change the recipe, just BIAB it. Actually that's a quite serious suggestion- if there's lautering problems then BIAB would be the method most likely to overcome them, for sure.
Both suggestions quite valid... but I rarely brew the same thing twice, so it will probably be a while before I try that again. The problem was exacerbated because of my HERMS setup.. so I just wound up doing a decoction. And a fly sparge, though it was hardly "flying". I'm sure it'll be fine.