@Eucalyptusbee
OP, I think the 'financial split' you have with your H is very one sided ?
I pay for childcare utilities food and kids stuff
He does mortgage school fees holidays and savings
Your 'expenditures' are huge ! And they are ALL on things you cannot do without ?
His 'expenditures' are actually now simply 'savings' (in whose name ?
) and holidays.........
So, in effect, YOU are 'financing' all day to day living and all regular, compulsory expenditures e.g utilities / kids clothes, food, equipment, birthdays, Xmas etc etc while HE gets to jack up HIS pension and keep all the savings (on 10 times YOUR salary), to spend on what he wants, when he wants ?
I'm aware that you've said it's for the kids future 'education', but what if he suddenly decides to change that ? What if he were to leave you ? What if he spent it on something you haven't agreed on together ?
It just seems like you're handing him ALL the financial 'security', while YOU spend ALL yours ! 
I really think that you need to have a long, long talk with him about how you feel, and what needs to change going forwards.
(If you tend to 'clam up', then perhaps writing down your 'points' to discuss might help ?)
Also, you're going to have to be ready with your replies when he reverts to his 'defensive position', that HE earns more money, and YOU'RE just making excuses because DD2 isn't some kind of bloody 'prodigy' FFS.
(I'd suggest giving him a 'breakdown' of your 'financial' contribution, including wages AND the financial cost of replacing you on the family e.g Cleaner, housekeeper, gardener, Nanny, chauffeur, accountant, secretary, cook etc etc When you total up your earnings PLUS what it would cost him to get someone else to do what you do, week in, week out, 365 days a year, YOUR bloody 'contribution' will add up to MORE than his bloody wages !)