Forum:Gun Damage Math?

So I realyl confused with the damage perfromance of some of my guns. I'll run the math and one gun will seem far superior or maybe even ridiculous and then i go and use ti and it's terrible. I think I'm messing up the formulas. Here's how I'm doing my gun math:

Damage * Multiplier * Fire Rate * damage buff percentage(+50% of course being done as *1.5) * Fire Rate Buff * Elemental multiplier (1.25 / 1.5 / 1.75 / 2)

So an SMG with 44X4 DMG, 6.4 Fire Rate, +33% damage buff, +23% damage buff, x3 Explosion I would get: 3225 DPS rounded up.

Some guns like Boom Stick seem absurd with this formula. I get numbers in the 100,000s of DPS with the math but it performs worse than guns that do only 1.5K DPS. What am I doing wrong here?