I have eveluated all the screen materials you mentioned, except the Vutec Material. I did not know they made an acoustically transparent material.
I currently use my Sony 1271 (750 hrs) with the Da-lite material with pretty good results. I only wish it had some gain. It was VERY inexpensive when compared to the Stewart Screen I ultimately would like to have but have a hard time spending over $2k for the screen. $200 vs $2000+
Does the Vutec have multiple gains available?? If so, where can I check them out?