iOS 7.1.2 Jailbreak from iOS 8

Hi, guys. I'm currently using iOS 8.4.1 on my iPad and it's a bunch of as* b**ching sells that give no thing new and nothing at all, but the biggest number of disappoints after I updated to it since my girlfriend were saying she doesn't hit it raw. Sorry, guys, but is there way I could bring back to my devise its performance, consistence and eliminate rapid battery draining by returning to 7.1.2 somehow, even if it's a jailbroken?