@newbee +1
You have two issues that needs to be resolved:
1. Your speakers are too close to the back wall. I know you said they are designed for placement close to the rear wall. Specification says you can move up to 2 feet. I would even bring them forward by at least 3 ft.
2. Your speakers have first-order crossovers. If my memory serves me right, your listening chair should be at least 8 ft from the speaker to allow sound from different drivers to merge. If your speakers are 8 ft apart center-to-center, then you should find the spot that completes the 8ft equilateral triangle, and then place the seat another 2 ft back. This may be the main reason why you cannot get depth.
Another aspect to work on is the absorbers hanging behind and above the speakers. I would start without those and see if the perceived depth improves.There is a port behind the speaker which can be problematic If it doesn't work without the absorber, then place those right behind the speakers and experiment adjusting the height.