Routine advice!!!

Hi I’m a ftm to 4 month old (nearly 5) twin girlies. I’m looking to change our routine to get an earlier bedtime and need advice .. Our current routine looks like this .. 6.30am - wake, change and feed (7oz) 8am/8.30am - first nap 10am - wake, change and feed (7oz) 10.30am - play 11.00am until 1.30/2pm - big sleep 2pm - wake, change and feed (7oz) 2.30pm until 3.30/4pm - nap From 4pm - awake and play 6pm - wake, change and feed (7oz) 7pm - awake for play 8pm - nap but can vary 9pm/10pm - bath, last bottle (7oz) and bed How do I bring bedtime forward? I feel like both girls are getting so angry at night because they are tired but fight right up until the last bottle is given at 9/10. They sleep through the night. I’m reluctant to let them sleep in later in the morning as I need the help in the morning before my partner goes to work. If I bring bedtime forward and give them a bath at 6 and then do bottle should I be changing the oz? To make it a bigger bottle and then giving a smaller oz “dream feed” at 10? I don’t know what to do 🤣🤣 should I even be changing anything at the moment as they are sleeping through the night? Wish there was a manual for times like this 🫠🤪 Any help appreciated x