I was in a similar boat, you might wish to check out my experience on this thread:- Topre/Nopre for a Boba U4 user 
You can check out the video/sound comparison between the following switches: https://imgur.com/a/7UVdm8w
- Box Pink stock switch
- Boba U4 in Ice Housings (62g)
- Niz 45g in Niz Nano75
- Topre 45g with silencing rings in FC980C