I would start by maxing both of your 401ks, not just your husbands. In such a high tax bracket, your primary concern is avoiding paying your marginal tax rate. That should still leave you with over $30k per year to invest somewhere.
The usual advice after that is to start a taxable investment account before you pay down your mortgage. The returns are hopefully a little better, and you keep access to that money as an emergency fund.
If you husband works for a hedge fund then you probably don't need any advice on what to put in your taxable account.
And I think you have some confusion about your Roth option. You can't move money from a taxable account to a Roth IRA just like you can't move money from your checking account to a Roth IRA, because you are income-restricted. Normally you can move money from a traditional IRA to a Roth, but it sounds like you also make too much for a traditional IRA.
The only way that I know of for you to put money in a Roth is through the mega backdoor Roth conversion, which you do by overcontributing to your 401k in excess of the tax-deferred limit, and then rolling from there. You can only contribute up to $52,000 total to your 401k, though, and that includes the employer match, so you may be up against that limit already in your husband's account. Not all 401k plans offer this option, but if yours does then it's probably your only option for adding to a Roth.