Ok, so my husband and I are lawyers and work in the city (am in law firm, husband big 4), though neither of us is a partner. I work 3 days pretty full on and my husband does 5 days. We earn similar amounts at the moment - I am well paid but have to give my pound of flesh when I am in!
When I was on mat leave, I ended up doing everything and facilitating his previous role in a transactional team that had similar hours to your husband - not great, felt quite lonely not seeing him and sharing the experience of bringing up our kids. And it was very hard to make the transition back to work. My husband changed his role out of transactional work to try to be more present. He travels more and still has a decent amount of work (but a bit more flexible) and it is a juggling act, but it works.
On my 3 days my husband usually gets home to relieve our nanny at 6 (she arrives at 7.30). we double team bed and bath and have dinner together quickly and then log on separately. It can feel like ships that pass in the night a bit.
On the two days he works, I look after kids and he has a free pass if he needs one BUT when he comes home we try to spend time together after dinner.
On the weekend, we each give each other a bit of time off if we can and try to have one more romantic evening together whether in or out.
We both have quite a bit of holiday thankfully. Next week, we have each taken a day off to spend together whilst our nanny has the kids.
I am reading in your posts that you want to do as much childcare as possible, you want your husband to be around more to spend quality time with you and kids AND that you want to have romantic time with your husband. Is that right? I don't think empirically it is possible to have lots more of all of those things at once - small kids time is not necessarily romantic reconnecting time.
Others have already said that quality is what matters here - can you find a few chunks of time in the week that you can carve out of his schedule to be quality time for family or for you as a couple, even if you have to give him a free pass to stay late on other days as a quit pro quo etc? Quality is also what matters for your kids - if you have an hour for you here and there and are happier for it, that is good for them too, even if it means that someone else helps with childcare. Try to focus on quality rather than quantity. There are never enough hours in the day. For anyone.