"Last marriage I was in I cooked the evening meals, did the food shopping, did the ironing, bathed the kids...." Better than many but still leaves an awful lot of other chores/mental load. That this IS better than most is the problem, means you probably think you did "loads" when in reality you probably still did much less than your wife.
My ex would say he did "loads" because he did his own ironing (but never mine or dds), the dishes nightly (unless he 'cooked' 1-2 nights a week - never anything particularly arduous, pasta n sauce, frozen in oven type stuff) and wiped worktops down (which he described as "cleaning the kitchen" no its NOTE cleaning the kitchen unless you're moving items to clean worktops thoroughly, cleaning the sink, fridge, freezer and sweeping & mopping the floor), we did the weekly shop together (but he never wrote a shopping list, paid attention to prices or really had much idea of what we needed to buy regularly unless it were specific items he liked) hoovered 2-3 times a week (but never thoroughly/under furniture/moving stuff to hoover that area), did bath n bed with dd on turnabout (but NEVER took toys out and rinsed bath out or put her dirty clothes & towel in laundry), put the bins out weekly (by which literally just wheeling it to the kerb! Not taking the actual rubbish out to the bin which I did daily at that point, NOR bringing the emptied bin back in), mowing the lawn (which he'd call "doing the garden" but it really was a 1 hour job max weekly in summer) but he never or very rarely:
Did general tidying/putting things away
Dusted or polished ANYTHING
Cleaned Windows or glass panels on doors
Laundry (he was a bloody liability if he went near washing machine! But he also NEVER hung/dried laundry either not collected it in if hung)
Cleaned the bathroom let alone the toilet (even if he'd done a monumental stinky shit!)
Made or changed beds
Cleaned up spillages he made then and there (this used to drive me nuts as it's much easier to clean up eg ketchup while it's still wet than try to scrub it off a worktop after its dried on!)
Cleaned out expired items from fridge (was actually a bigger for putting empty or damn near empty juice/milk containers back in fridge rather than rinse & recycle!),
Clean fridge or freezer
ANY household admin - I dealt with all the bills, insurances, bank account, organising not/service for car (even before I could drive myself!) medical appointments (not just dd and I, I used to make his sometimes too as he was "too busy" but would eg be constantly moaning about a toothache!)
So yea I'm VERY sceptical of men (or their wives/partners) who claim they do a reasonable or equal amount.
Many studies which show that men frequently over estimate how much they do and under estimate what needs done and how long certain chores take.
"He thinks he does loads" because he is comparing how much he does to how much other men he knows do and NOT to how much YOU do!
If you're working longer hours he really should be doing more than you.
I failed obviously in addressing this issue (much younger and less assertive then).
All I can think to suggest is write down everything that needs doing and divide them between with him taking on a few more than you OR take on more time consuming jobs - because he has more time to do them!
That would be fair imo.
"A good rule of thumb I often read on here is that there should be equal down-time for both parties" I'd agree with that
I now live with adult dd and it's a challenge as - again - she THINKS she does "loads" because she compares herself to her mollycoddled friends who at 18/19 their mothers are still getting their drinks and snacks for them and they're not expected to do ANY housework. Luckily I have her bff and family to refer to (her mum and I similar outlook, plus they have a big family, loads of pets and both parents work full time so everyone HAS to pitch in)