Cutting Pills - opinions please!

Hi, i decided to up meds by only 1mg so brought a pill cutter and today took 1st extra 1/2 tablet (i'm only currently taking 1 x 2mg tablet daily) I've since received a reply from my PD nurse who avises me not to do this as it will stop the slow release working and recommends going to 4mg, yet i'm stubbonly reluctant to do this! Has anyone had any experiences they can share? or received the same or different advice?

Many thanks