Actually you cannot be as productive. period.... that's the trade. you either work or you delegate doing both is almost impossible.
Every meeting takes time away, every planning as well. They can expect whatever they want .... they lost a productive worker and they have to compensate not you.
The longer you do it the more they expect it from you. And here's the thing ... you're lead now you should be the least productive but the one with the highest efficiency ..... you need to promote your team this is your job now. Getting others more efficient, review, talk, coordinate.
Or you flatten the hierarchy and work with your team ....