I glued my elastic there. Some Troopers use snaps to make storage easier but I do not have that issue.
For elastic vs webbing think of it this way.
Webbing for when you want to control movement elastic if you want it to have some give.
For me I feel elastic is better as it makes it a tad easier to slide the bicep and arm like a sleeve and the forearm will stretch a bit rather than being rugged.
You double over the end to make a loop too make it easier to grab and clasp. Even with velcro it could still push on it and provide a gap.
I know in shasha's build she did velcro and still ended up heating them to close the gap.
Looks good! Just like mine before I put them in a hot water bath to close them more in the back. Elastics you can always pull off, reposition and glue again to make them tighter.
Also can bend the hooks more so they hold better
I think your best bet is to get more tandys and double it up. You can even put some type of spacer between (washer, scrap thin ABS, etc) to prevent it from ripping through.
As long as you look good on the outside what is not seen will not impact approval. I know some individuals have done an ABS like "hook" on the right side to prevent things from popping out, and keeping the ab armor close together.
I use a Popsicle stick when I applied mine. Its looking good! fill in a few small parts you got and sand it all down to smooth. Than apply a small amount of acetone to the finger and run it over the sand to give it back that shine! I'm excited to see how this turns out. It actually looks like that flat edge is not as noticeable either! GREAT WORK!
You got this! Little bit of abs paste along the ridge and feather it out. Much like icining cupcakes. Sand to smooth and than can dip a finger in acetone and run finger along to bring back the shine
Here are a few EIB approvals for ATA
And Centurion for ATA
Try double checking their build threads and see if the same issue came up. I would wait for the DOs to chime in