RNG weapons

having fun with RNG again but finding some conflicting issues (according to the guides). most guides are stating Bow's are the way to go for RNG with jishnu's being top as long as you have a good crit dmg set. well I went ahead and built up a nice crit set with the alluvion bow with nice augments. crit dmg+, rng acc/att, dex+.. and it's not turning out to great. the gear im using is adhemar head, and herc for the rest all with aug's of crit dmg+ 45. accessories are begrudging ring (which with this months ambuscade im not expecting much out of) and either ramuh's +1 or epona's since I haven't finished testing the multi attack side of it. earrings are both mache for the dex, neck and waist is light gorget/belt and ambus cape with max dex, ranged acc/att, crit chance. with all that im only hitting about 10k jishnu's. while on the other hand for guns im using doomsday with great aug's from my COR and herc head/body/legs with mab +2325 and wsd+ 3~4, adhemar feet and carmine hands. without even trying im hitting 13k trueflight @1k TP. not even equipping a cape or neck/waist to help. so from the testing ive done and first hand experience now why are bows better than guns for RNG? or has something changed and guides just never got updated?