A useful post.
I`m not a fan of rubber straps but if you're going to do rubber you might as well get a good fit! At this price it's a no-brainer if you fancy a change.
I agree with your comments re the DSSD, it suits the GMT a whole lot better.
One useful tip when fitting springbars to a rubber strap: lubricate them with a spot of silicone grease. Also worth trying springbars of different thickness to get the best fit.
Paul