Did you take time to dial it in by ear, or just set it the same as your original?. Maybe a dumb question, but the range and taper of the pots can be very different between the two pedals, so they may have to be set to very different settings to get a similar sound.I’ve used my original ODR for every gig for the past 2 years, I never turn it off on the main gig I do, just roll down the volume to clean it up but it’s that open, edge of breakup sound that I leave on all the time. I did the same with the mini twice this week just gone - I knew it felt weird and wasn’t sounding right the whole time but it wasn’t until the singer came up to me after the gig and said “whatever you’ve changed, change it back, your tone was horrible” this is after playing in the same band 60+ shows a year for the last 4 years, and he noticed the difference! Best of luck to everyone else with their minis, I’ve already sold mine.
Al