Do what you enjoy. Enthusiasm creates energy creates high performance creates progression, wealth and kudos.
The problem is that you’ve gone in at the junior end and now you’re being treated as a junior. Why on earth move sideways to a similar role in a photocopy consultancy where you run the same risk of being assigned to a role that you’re not cut out for. Get yourself a proper PM role in “industry” and if in two to three years you really want to move back to consultancy do so on your own terms, as a PM on a proper PM salary.
There is NO WAY you should be taking a lower salary in a consultancy firm than you are being offered in a client organisation! That basically means the consultancy world values you less than the client world. Why work in the area that least values you? And if the consultancy values you less than the client, you’ll always be given low level dogsbody work to do.
BIG4 firms offer a great career option for many people, but it’s also pretty 10-a-penny these days as a CV enhancer.
As for leaving after 11 months? The firms interviewing you don’t seem to mind. Unless you make a habit of it, neither will anyone else.