Is 451 craftsmanship enough

[PROBOUND]

With the indroduction of the Lucis tools our Craftmanship has been boosted by quite a large margin (490+).

453 was the magic number previously due to the [PBP > RS x 2 > CS2 x2] rotation which allowed us to finish a 4star synth within 5steps as well as using the least amount of CP (40 including SH2).

With 490+ Craftmanship, is there a new rotation that improves on this? Perhaps a 4step progress? I have not tested using Shark Fin Soup or the FC Craftmanship buff. Would the use of IG2 be useful now regardless of the extra CP cost to perhaps reach a 3step progress? Can any of you pro crafters confirm?