My Diet ...please help

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Looking for any advice please,,
First off im 39 yrs old 269-270 pds 36" pant dont know body fat looking to loose some weight an maintain as much muscle as possible will do cardio after workout on workout days,i work out 5 days an hard,
wake up 5.00am
meal # 1 515am approx
2pk instant oatmeal
5 hard boiled egg whites
1 whole hard boiled egg
1 cup skim plus milk
470 calories 56 carbs 44 protein 10 fat

meal #2 900am approx
protien shake with 2 tablespn flax
350 cal 3 carbs 25 protein 23 fat

meal#3 1200-1230
tuna on low carb multi grain with 1 tbsp low fat mayo
6 0z string beans
375 calories 31 carbs 52 protein 5 fat

meal#4 330-400pm
prework out protein shake
1 banana
195 cal 21 carbs 25 protein 2 fat

work out approx 530-7 with cardio

meal #5 715 ishpm post work out
n-large shake
600 calories 86 carbs 52 protein 5 fat

meal#6 900-10pm
6-8 0z grilled chicken
6 oz srting beans
1 tblspn flax
520 calories 12 carbs 56 protein 14 fat

This is something im looking for opinions on adjustments? i will not have the post work out on off days
approx 2500 calories 210 carbs 255 protein 59 fat
what do u guys think seems calories are to low please help me adjust,thats 2500 on a workout day