Thanks very much for your interest in using thicker Sheshou bands like 1.2mm manly hunting bands.
I wonder what ammo size you use. As for me I use 16mm and 17 mm steel balls with a draw length of 90 cm. I cut my bands 24 cm long. Tapering it 25mm at fork to 20mm at pouch. 2cm is used for pouch tie and 4cm at fork tie. I use hardwood fork. Trust me, it can send these balls with immense power and longevity of bands is more than you like it. These thick bands give you longevity of big tubes and speed of flat bands: the thing which is very rare when it comes to flat bands. Only dankung has provided ability in flat bands. So no need to carry spare bands or slingshot. If you do, then its more security and total confidence in your arsenal. But you can also try an extreme taper of 30 mm at fork to 15mm at pouch wth the same length of 24 cm. You can shoot longer distances with extreme power. Longevity is a bit reduced, but you will love it. But if you you use lighter ammo than 16mm or 17mm steel balls,please ask Tim Lee to recommend a taper. I also advise you never to forget to turn the pouch 90 degrees. Puuch size I use is 9cm long. Width is 1.9cm to 2cm.
I wish you all the best
Ahmed