I'm pegging my flag to the mast too
Luffy: 460 Million Berri
Zoro: 220 Million Berri
Nami: 35 Million Berri
Usopp:75 Million Berri
Sanji: 120 Million Berri
Chopper: 100 Berri
Robin: 100 Million Berri
Franky: 86 Million Berri
Brook: 52 Million Berri
I don't think Sanji, Nami, Chopper and Brook have done enough to get much of an increase. I don't doubt they'll get some increases due to their association with Luffy, and the WG will likely reconsider their overall threat levels after the Two year break, but overall I don't think they haven't made much of an impact as individuals to warrant a large jump.
Luffy will not get a massive jump either imo. Take Eustass Kid. He started with a slightly less sized Bounty then Luffy before the TS and it's taken him TWO YEARS to get a Bounty of 470Million. I don't see Luffy getting a larger bounty then Kid for his very brief (in comparison) appearance since Marinford. It's possible Luffy's Bounty hasn't risen despite Marinford as the WG may have assumed he had died, but if they did consider that then his bounty would have been raised before they arrived at Dressrosa. Besides anyway I think Oda may save a massive bounty for Luffy later on down the line.
Zoro has fought against Fujitora (albeit briefly) but he was able to get out of one of the Admiral's attacks and thus showing his potential skill to the WG. They will most certainly raise his threat level based on that alone. Not even including Zoro beating Pica, a significantly powerful foe. BUT his role as second of the Straw Hats and not Captain may temper an exaggerated Bounty. I may have slightly undershot his Bounty but I am positive he won't make 300 Million.
That leaves Franky, Usopp and Robin. Robin despite being there at Dressrosa has don't nothing of significance. I think like the Swirlies, she will get a raise based on her return and Luffy association but for nothing else really. I also think Oda is unlikely to give her a large jump anyway.
On the other hand Franky and Usopp have so far had larger roles in Dressrosa. I'm discounting the "God" Usopp as that is more of a personal vendetta by Doflomingo so I don't see like a giant raise at all. The WG will likely take note of his sudden popularity though but are obviously more interested at threat/strength level level and his involvement in the latest Arc. He is also still a relative unknown. Of course I could be completely wrong too. I'm sort of 65% certain on him. Franky has made some waves in Dressrosa and taken on a hoard of Marines too. He's going to be noticed. Not like a mass threat but they will most certainly reassess him. Franky and Usopp are kind of the hardest for me to define at the moment. They are the the unknown variables in terms of bounties.