If you're at 80 and your screen is still brighter than the prints, then we must turn our attention to your room light. Are you sure it's bright enough?
@HayleyJ you're following the wrong instructions, ya wally! You're supposed to be on these ones: https://ask.damiensymonds.net/topic/36351-i1studio-pc01/
Ok, let's rule out the latter straight away. Images for print must be "Save As". They can ONLY be saved one at a time, bulk saving isn't possible.
For watermarked web ones, have you set this up yet? https://www.damiensymonds.net/act_web.html
I'm so sorry mate, I can't think of any "clever tricks" here. It would just have to be cloning.
https://www.damiensymonds.net/2010/10/role-of-masks-when-cloning.html