ios 11.2.5 is awful. Can we downgrade to 11.1?

I habe been using ios 11.1 on my 6s Plus for the last few months. The update was suprisingly good. Last week, I was advised by an Apple Store specialist to update my phone for security reasons. After updating from 11.1 to 11.2.5, my phone went to #%*^#%*.......... My Battery is totally messed up now. It will go from 85-74-62 in minutes and drops in intervals of 10..... The "light" sensitivy option in settings for 3D touch is plagued with bugs and is now worthless. The update in general is full of freezing of device, etc. It's bizarre to see a phone go from perfect working condition to utterly useless by an "update" that Apple told me to download....... Maybe they do want to crash peoples phones so they have to buy a new one every 12 months?

Please bring back ios 11.1..... Does anyone know how to get back ios 11.1 from 11.2.5????? I was going to try 11.2.6 but I am hearing awful things about the battery icon now just disappearin. LOL. Apple needs to understand 80% of iPhones out in the world are not the iPhone X.... and they should be sending updates out for specific models, too. Google and Android are so much smarter I am realizing because when they send an update out. The updates are for specific models. Very dissapointed. Now I have a $950 paper weight.... And I only purchased the phone like 1 year ago...... lol