change the +5000 Weapon Damage on MH to +100% Weapon Damage. but only if your Power is 34 or higher. you will be doing more damage that way. if your Power is 67 or higher, take off the +4975 Ice and put another +75 Crit Damage. this way any Crit Damage is 5x damage, and your Deadly Strikes are 10x damage.
right now you are doing (((BWD + Power) x 1.25) + 4926) x (2.181) +9975.
((BWD + Power) x 1.25 x 2) x (2.181) + 5000.
the 1.25 is your Flintlock Item Quality, the 2 is Weapon Damage %, +4926 is Weapon Damage +, 2.181 is your Elemental Damage %, and the +9975 and +5000 are Elemental Damage +.
as you can see, BWD with Power, especially if you put a lot of points into Power, gets multiplied by Item Quality and Weapon Damage %, then adds WD+. then that is all multiplied by Elemental Damage %, then you add Elemental Damage + last. then you do all of your other multipliers after, like Ricochet & Glasscannon. Explosive is based on damage up to ED+ then multiplied by anything else, except Ricochet, which only affects… you guessed it, Ricochet! with WD% of 100% or 200% & ED% of 200% or 300%, you don’t really need WD+ or ED+. if you have the space in your Build, then put WD+ on your MH, because that can get multiplied by ED%. ED+ doesn’t get multiplied by anything before it in the formula, only by any multipliers that come after, like Ricochet & Glasscannon, for example.
now, after I said all of that, Elements Set (5) gives you a 37.5% chance to cast 1 extra attack, with a 1 second delay (at least I think there is a 1 second delay), with a different Element than the original attack. since you are doing 7.8 attacks a second, and each of these attacks are casting 4 Multi Attack Ricochets, Elements Set is giving you 2.925 extra attacks every second (these extra attacks don’t give multi attacks, they are extra attacks just like the Multi Attacks are). the Elements extra attacks are probably lost in the crowd of all of those other Ricochets.
on the Masochists Fetish, when you get Obsidians, go for Crystal Crit Chance first. with Crystal Crit Chance, the base +10% Crit Chance every one gets, and 2 Death Natures (+2.5% Crit Chance each), you will have +60% Crit Chance, and can get rid of all the other Crit Chance on your Build and maybe increase your Deadly Strike from +10% to +30%. if you get Crystal Crit Damage instead, you can only take off one +75% Crit Dmg to open up a space and still have your maximum Crit Damage (a Crystal & 2 Epics). then you could only add one more Deadly Strike for +20%. still better than +10%.
you just might see 300 to 450 million damage.