An upgraded one is a must, deallen what's the output on your relay set to with the lightweight bolt ?
I only ask 'cause my mini had an NDZ bolt and I got down to 155psi and techs at NPF said it was the quietest mini they ever heard.
Failing that coupe Id suggest you saved for an Etha or an Axe if it's financially viable. They are both very good markers and operate the same way as a Mini, so they are very easy to maintain.