Reconstitution question

Hey everyone basically I always get 10 or 20 mg vials and I reconstitute those with 1-2mL of bac water (1mL per 10mg of Reta) but I recently purchased 50mg vials which would technically need 5mL of bac water (bc that’s what I was taught) but when I asked, I was told it wouldn’t fit that much and that I should just do 2-3mL of bac water. But for a 50mg vial? How would that change things. Would I have to upper or lower my weekly dose? I haven’t done Reta in about a month but the highest I ever went was 5mg a week (2.5 twice a week) and I was on it for about 6 months and before that I was on wegovy for a year. But while doing 5mg a week I didn’t see any change so im thinking to go up a higher dose now.