Their fees are giving me a little pause since they charge a percentage of the amount in the account and additional fees for each transaction.

Due Diligence and Feasibility Studies - What studies or tests are essential before purchasing raw land?

100% agree.. especially with syndication once your money is in their account you have zero control.. your not on the checking account your relying on either sponsor prepped financial although some are audited which is better of course..

Here are a few options: max out 401k contributions for you and your spouse, max out HSA contributions, make charitable donations, harvest tax losses, etc.I recommend finding a tax strategist who specializes in real estate taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

The accounting system allows you to keep track of costs like mortgage payments and amortization with insurance and taxes as well as part of the asset management. 

You will be able to take advantage of it in a SDIRA if the syndication also has taken on debt and therefore passes UDFI on to your account. 

You might make more money in a good interest account or dividend paying stocks, without the hassles of tenants. 

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

Right now interest is in the 6 figure.I spend a great deal of time on it with the contracts and accounting . 

Studying for and receiving the CCIM designation will be a solid plus.