Run the third schedule properly and it's the expensive one. 250 to open, 125 a year, 95 per transaction. Funding the note is one transaction. If incoming payments are transactions, that's twelve more, so 250 plus 125 plus thirteen charges at 95 is 1,610 in year one against a 300 flat plus maybe 50 to wire. On 150k earning 9 percent you've turned 13,500 into effectively 11,890, which is about 107 basis points of fee drag for administrative work.
The way most people solve the payment-posting problem is a third-party loan servicer. They collect from the borrower, handle the escrow and the year-end statements, and remit one payment or one ACH to the custodian. Published pricing tends to run 15 to 30 a month plus a small setup, and it converts twelve custodian transactions into twelve servicer charges that are usually cheaper. It also gives you an independent payment history, which matters enormously if you ever have to prove default.
On who pays the fees, custodians will generally let you pay from the IRA or bill you personally, and paying personally preserves more tax-advantaged capital inside the account. Whether an outside payment counts as a contribution depends on how the fee is billed and characterized, so confirm the treatment with your CPA rather than assuming, because contributions have annual limits and excess contributions carry a penalty.
The thing I'd actually shop on isn't price. It's how fast the custodian executes a funding instruction. Some take five to ten business days to review documents and wire, and a borrower who needs money Friday doesn't care about your custodian's queue. Ask each one for their stated turnaround on a note funding and get it in writing.