alt/az astrophotography with an 11inch sct is possible but has some serious limitations, for many years I was using alt/az astrophotography with a 12inch sct and pushed the set up about as far as I could getting very average results. (See photos links below as an example)
Lessons I learned:
1. Have well aligned and balanced scope to gain stable tracking
2. Use high camera gain (iso1600) and maximum of 30sec exposure (10-25 works best)
3. Need to have well over 100 subs with 50 darks to reduce noise and increase signal to noise ratio (200-300 works best)
4. All subs will show field rotation, final stack of all subs will need to be cropped to remove areas worst effected by field rotation.
I would recommend getting a wedge for your 11inch sct, I found a cheap field de-rotator and it works well with my 12inch sct but it has limitations also.
My Last Image in Alt/Az No Guiding is NGC 5128
https://www.astrobin.com/82705/?nc=user
Eta Carinae Nebula "Keyhole" NGC 3372
https://www.astrobin.com/45433/?nc=user