The older CE 90 had a spine of .530 and the new CE 90 have a spine of .588.The old CE 150 had a spine of .487 and the new CE 150 have a spine of .495.There isn't really any equivalent to the CE 90 in other brands,close.Most other carbon shafts you have .500 spine and a .600 spine carbon arrows.But to most of the lighter spine carbon are about a 30" arrow shaft,some may be longer but check before you buy.I bought some dark grain GT 15/35(.600 spine) blems from Big Jim and they were 32" long.Just check the arrow length of the lighter spine carbons,you have a 30" draw length.You could probably tune either a .500 or .600 spine carbon depending on point weight and length.A .500 spine at full length may work better with your 30" draw length.