PT test height and waist

Hey all just wondering if anyone has any advice on how to drop 2-4 inches off my waist without losing muscle mass. I’m a bigger guy 6ft 240 with a 38 inch waist, I max out the strength components and if I do the minimum for the HAMR with my waist now I’ll be in the low 80s if I get my waist down I’ll be near the high 80s/ low 90 range. My PT test is due in August any help and advice is appreciated