I'd rely on an LOI template so you're not spending a ton of time as you increase volume. My goal is to send 1 written offer (sometimes straight to LOI, other times IOI) per week. I've been averaging about 3 per month during my search with volumes trailing off during holidays & the summer.

On the proprietary side, I see emails sent, replies, seller calls, financials reviewed (i.e., after seller call can you progress further, financials is my indicator but there are likely others) and offers as my key funnel metrics.

I've sent out roughly 1 LOI each month. In the last 2 months, I've reviewed roughly 80 CIMs.

Before LOI, I've reviewed the CIM, spoken to broker and seller at least once, often visited the site, looked at some level of deeper info such as tax return, lease, customer contract, or other relevant information, and discussed price and terms at a high level.

About 80% have been through brokered deals vs proprietary.