It seems quite obvious that your stock bridle must have been quite different than the bridle on my (one of the first 5 Shadows) to arrive in the US quite a few years ago.
My Shadow came with 2 tail weights? One with a light weight plastic end piece...with a copper colored wire insert.
The other one seems to be a heavier metal one with a wire than looks almost like the "bit end" of a tungsten drill. Looking closely...I can see the marks left by a roto-tool type cutting wheel.I too have added a small "pigtail" line at the top spreaders and my indiviual Shadow seems to pitch into and out of roll ups WITH THE TAIL WEIGHT IN!
Bottom Line: My indivual Shadow...NEEDS THE BLACK PLASTIC END CAP WITH THE COPPER COLORED WIRE TAIL WEIGHT FOR BEST ALL AROUND PERFORMANCE!
Without the weight my Shadow flight suffers and simply is quite lack luster just "doesn't cut it!"
Speaking of "CUTTING IT?"...The best performing of the TAIL WEIGHT WIRES, APPEARS TO LOOK VERY VERY MUCH LIKE IT WAS MADE FROM A CUT OFF PIECE OF ELECTRIC WELDING ROD?
Guess I had better check the measures and take some macro photos in order to compare your HQ Shadow...with your new Shadow?
(DON'T FORGET...however how much flight performance can change by simply changing the lengths and line dia. of your flying lines.
This change in flying lines alone... can often
INSTANTLY turn that beautiful flying sport into a REAL JUNK YARD DOG!