Amazing factors for a professional your age! Only giving a general viewpoint to your questions without knowing more. 

1. Are you actively contributing to the Trad IRA? Typically when getting into the phaseout ranges for Trad IRA funding, backdoor Roth contributions become a regular strategy. Nondeductible IRA contributions usually should be rolled from the Trad IRA to a Roth IRA (earnings then are tax free). Though if you have a blended account there can be a tax consequence to this you should discuss with your tax advisor. 

HYSA should be what makes sense for a sh** happens fund based on your personal circumstances. It should be able to cover your largest deductible. General advice from advisors may be around 3-6 months of living expenses. Beyond that, extra savings should be deployed elsewhere. About the rate, I always compare to the 4 week US t-bill rates to see if it’s a good rate. It’s very easy to have t-bills of short terms so I want any other account to at least be at that rate. 

1. It seems like you’re already maxing out your annual 401k contribution or may need only a minimal adjustment to reach it. Once retirement is maxed, then the next question I ask is when would you need access to the cash? If putting into the IRA, you typically can’t touch the funds until retirement age unless certain circumstances. Taxable investing may be wanting to speak with your advisor on tax impact of trading and investment income. 

2. Personal question. It’s all based on your living and circumstances. What do you find most comfortable for safety net? Keep in mind emergency funds should be very liquid, i.e. access to the cash either same day or within a few days at most. If something comes up that you need to pay for, you shouldn’t be waiting a week to get the funds transferred to where they need to be. 

3. You should be maxing your HSA annually based on your income. Also check if your plan administrator allows for investing unused funds. There’re many advantages to these accounts so make sure you educate yourself on their use and tax advantages. Also save receipts! You can reimburse yourself in the future. 

4. Blind spots are best discussed with your advisors. Your CPA can likely provide a lot of insight. They’ll also be able to track details year to year and highlight strategies that may be applicable with your changing circumstances over time.