RE: poor type quality on the "!" via u/TheGuyAtThePlace265 at https://reddit.com/r/typewriters/comments/1no1whe/poor_definition_on/
Lots of things can cause this in rough order, check:
Clean the slugs
Ribbon can have an effect. Silk is generally crisper than nylon which is crisper than cotton.
The paper can have an effect depending on the thickness and general grain.
Typing technique can play a part. Often you'll see issues including ghosting and other problems, particularly if you bottom out a key while typing.
Are you using a backing sheet?
Is your platen rock hard or has it been re-covered?
Is your ring and cylinder adjustment properly done?
The most frequently abused slugs are often the ones at the the ends of the segment and 1/! definitely qualifies. Sometimes a small bit of forming can clear things up.