the finished 35/55 arrows might be too stiff, even at 30" of shaft length. i'd recommend starting off with a far weaker spine carbon like a .500 and do the bare shaft test for flight. but lots will depend on the shooter, as well as the shaft/arrow. in the best of all worlds, borrow, buy one full length carbon in both .600 and .500 spines, cut each to 30" and bare shaft with different point weights to check for flight (once the bowstring's nock point is correctly located). yer looking for the shaft to fly at 5-10 yards as if it was fletched. make sure arrow nocks don't fit tight (for a split finger grip). light bows (40@28) are gonna be a bit harder to set up with the correct 9-10gpp mass weight, don't wanna go too high as performance will be hindered.