Any advice would be appreciated!
LO will be 8 mo in two weeks. Ebf till 7 mo and used to accept ebm in bottle with no issues. I am going back to work in a month and don't have the option of pumping and I am on call for 36 hrs straight every fourth night so can't do bf anymore although would love to

so I have been working on attempting to wean him with minimal luck.
He learned how to use a straw cup and will accept bottle too reluctantly! However he only take 2 oz willingly and 3 if I coax him for a little bit! In a 24 hr period he was taking six feeds, four day feeds and two night feeds. I try to add formula to his solids. I was able to replace his day feeds with formula over last three weeks and last night I tried to give him bottle at night! He screamed for an hour! Was up three times during the night but won't even accept the bottle near his mouth.
This is what his routine looks like
Wake- 6/6:30
E 7:00 milk 3oz, hr later solids 1 tbs cereal with two oz milk 1 tbs veg, fruit and finger food but mostly plays
with it.
S 9:30-11
E 11 milk 3 oz , hr and half later: half tbs cereal with one oz milk with half tbs fruit with finger foods
S 2/2:30-3:30-4
E 4:00 milk 3oz
Dinner 5:45/6 1 tbs cereal with 2 oz milk 1 tbs veg 1 tbs fruit with finger food
Bath 6:15
Used to be bf before bed switched to bottle since two days accepting only one or two oz!
Sleep by 6:30/45
Two night feeds at 11ish and then 4ish
So yesterday I attempted to wean the night feeds in thought of increasing his daytime intake, he starved for 12 hrs and the day before his milk intake had not been great so this morning I was hoping for an eager hungry baby gulping down milk! But he woke at 6:15 and got busy playing at 6:30 as usual took 2 oz and then I had to coax him for more!!!!! Around 8 for his solids he got impatient by 7:50 and eagerly gulped that down!!!
Things I have tried till now:
Mixing bm with formula while weaning to increase acceptance, no luck
Grandma, DH offering bottle during day/night: same reaction
Tried different formula, no luck
I have not tried different nipple as he used to take playtex only in the past with no issues
Tried feeding him at different spots in the house with minimal distraction
He only takes avg 18-20 oz in 24 hrs with lots of effort on my part! I worry about it all day and last night and this mornings behaviour really threw me off!!
Is there anything I can do to improve his milk intake?
Or do I leave him be !!!
Should I stick with bottle or straw cup for feeds??
Also at 6 mo he weighed 16 lbs 14 oz and at 7 mo it was 20 lbs 6 oz!! He went though a growth spurt!
Any suggestions would be appreciated! Thank you for taking the time to read