GG, impressive gear! ... have you tried running that highbanker with the riffles and mats removed so everything just dumps into the fluid bed?
No, but early on I did put the FBGT at the end of the highbanker and caught a couple specks.
After that is when I came up with the "Add a Trap" that you see in the above post.
Nowadays when I run a highbanker I mostly just use the FBGT unless there is some clay and mud then I may use the A-52 but if there's lots of clay I use my trommel and Clarkson style riffles in the sluice, with a vortex mat sluice after that.

Old photo, Now I always install an "Add a Trap" after the sluice.
As it is, how much gold makes it down to the trap?
Not very much just a speck or two but the peace of mind knowing you got it all is priceless.
Plus you can run your material a little faster and not be paranoid that you may be running too fast or too steep or feeding too much material or worry about your moss getting loaded up, or flour gold migrating underneath and out the end, too much flow, or an accidental blow out etc. Makes most types of sluices pretty much fool proof. The guys on Gold Rush sure could use one of my commercial designs on the end of their wash plants as much gold as they obviously lose off the end.
I do find quite a bit more "would a been lost" gold in the "Add A Trap" that I designed for the end of my 4" dredge (dredges are known for loosing a small percentage of tiny gold but make up for it in the volume that they do catch) Just tiny stuff mind you but it adds up in a years time.
Here in Indiana the take is usually small so we need every speck we can get!
GG~