Ceiling fan installation in masonary ceiling - Anchor failure considerations for dynamic loads
It reads like you are at 'industry standard' as most installs wouldn't go further than a concrete anchor. I understand your concern, and appreciate the level of detail you're delving in to figure out alternatives.
In terms of industry knowledge, most of the folks here have experience with residential, single family home classification, not industrial, or commercial application, it's all wood.

If you're looking for other options, find the exact weight of the fan, and find a hard rubber (or soft plastic) washer that only partially compresses from the weight(very partially, gross up your concrete anchor by a 3/16th (or whatever the net distance increase is from the washers, and add first a metal re-enforcing washer, followed by the soft washer. this will provide a break between the fan and the anchor.

One important point to cover everything is that you'll need about a week of curing before you'll hit the 2000psi (assuming 20mPa). A day or two less if you're using 25mPa.

Disclaimer of course is that I'm not a fastener guy, and do not have extensive knowledge of the failure rate of in tension concrete anchors with vibrations applied.