Target Final Gravity not reached

[Stoichiometrist]

I have a Chimay Blue type recipe in my fermzilla, based on lethal’s recipe from this forum.
My Starting SG was 1.080 and my target FG was 1.011, aiming for 9% abv.
AA would be 85%.
Temp 20 degrees C, raised to 25C over 6 days.

My current SG is 1.020, with corresponding 7.9% abv and yeast efficiency at 75%

It’s been complicated because the KL pressure kit was out of stock until last week and I chose not open the FZ for early samples to minimize infection risk. Bubbling stopped at 10days and so I dropped the temp to 10C in a wine fridge.

It’s tasted good but maybe a little sweet.

Questions.
Was my target FG overly ambitious?
Is an AA of 85% unrealistic?
Is there unfermented sugars that need to be fermented?
In which case, should I repitch the WY1214 (which I have collected)??

I’m now equipped with pressure kit/co2 and I have the FZ at 10psi. So I don’t have to bottle the brew...

 

[philrob]

Which yeast did you use?
Some yeasts will start to give up the ghost once your alcohol levels get to an elevated level.
WY3787 Trappist Style High Gravity Yeast is the duck's nuts for higher alcohol Belgians.

 

[Stoichiometrist]

Which yeast did you use?
Some yeasts will start to give up the ghost once your alcohol levels get to an elevated level.
WY3787 Trappist Style High Gravity Yeast is the duck's nuts for higher alcohol Belgians.

Hi. I used the Wyeast 1214 which I believe is the Chimay yeast