You collected the numbers yourself, and the result is: it’s very tight but possible, however, there are no longer any jumps possible. If the car ever needs to be replaced (which certainly wasn’t included in last year’s calculation - or is there currently a payment)?, you’re already at a loss. I think your equity is really good, it’s almost 30%, which already provides some security.
You should realistically consider whether the woman’s income can be increased in the foreseeable future enough to generate significant surpluses – that is, freely available money that isn’t already allocated. In the current situation, you’re living only for the house and everything else no longer happens.
Family planning completed?