Good topic.
The only idea I have for you is back door roth contributions. Doesn't save taxes now, but will later. If you have traditional IRA accounts, you can look to see if your 401(k) administrator will accept a roll-in of the traditional IRA accounts. Similarly, you can look into mega-back door roth contributions to see if that is available to you. If I recall correctly, that also has to do with the rules of your 401(k).
Oh, and be diligent and thorough in identifying and tracking business expenses.