I used WY1450 which has been over attenuating on everything compared to what Wyeast list it should be getting. This went down to 1.005, which gave me 90% apparent attenuation, so that could very well be my issue. Due to the nature of that strain it doesn't come across as thin, but it's lacking what I would look for in a Marzen/Okto. It's easily drinkable, ended with 5.7% ABV so it's not overkill.
I've gotten better attenuation on almost every beer i've made, so I don't know if I just need to raise my mash temps a couple degrees, or just plan for 5% better attenuation that what's normal. All part of the hobby I guess.