I don't really see how any of these weapons are overpowered and why you'd want them nerfed. The last thing the server needs is more random weapon changes that completely change the weapons.
Jetpack: You only have 2 charges vs a Flare Gun being spammable for mobility, its much slower to pull out and execute, and is much less reliable in general on top of not actually being a weapon that does damage. The Jetpack basically trades off ease of use for self damage and less damage done. If anything I think its a bit weak.
Dragon's Fury: The Dragon's Fury's airblast is already awful, and I wouldn't recommend nerfing it any more. I can't really see how you think it does too much damage when stock has a damage buff on it plus its a lot easier to aim. If anything you're still trading airblast for damage, which is fine. Leave it as is.
Banana: The trade off is that it heals teammates for garbage for how fast it regens. You'd use the Sandvich is a situation where you need to heal teammates a lot, like pocket heavy, Banana is for solo heavy without a lot of teammates, and the Dalokohs is if you want overheal with a slightly faster regen than the Banana. I just can't see how it would be seen as overpowered at all, even as is I'd probably use the Sandvich over it because I heal teammates as a heavy as often as I can.
Not really gonna bother with the Hot Hand because its a gimmick weapon and I could care less about how good it is. People'll use it if they can slap, regardless of how bad it is, no reason to really fix what's not broken.