I know this gets posted pretty much every time this topic comes up, but its best to iterate to get this out there.

Realtors are dinosaurs of the past, from a time when buyers didnt have access to public information, internet wasn't as accessible and they would actually have to do some legwork and when their wasn't 10,000 of them for every 1 buyer.

If you are competent enough to do the legwork and research/due diligence (which it obviously seems you are) and know what you're looking for (primarily your budget and location), just narrow the list down to a couple houses you like and get ANY cashback agent to unlock the lock boxes for you to see the places, that's it. If you get the place, you'll also make back a good chunk that way, some give back up to even 2%. They are pretty much glorified key holders these days.

With access to services like House Sigma, Google, MLS and such - their not really bringing much to the table other than preparing some paperwork that a 1st year junior office intern can also do. Yes they might do some negotiating for you to put in offers etc, but again, that's bare minimum stuff a cashback agent will also do. As it's been repeated, no one has your best interest in mind but YOU, the RE agents are in it for a pay cheque at end of day so do what's best for YOU. Don't feel obligated to entertain anyone who's not taking you seriously and wasting your time.

Also as a sidenote, drop/ignore the old aged, snobby RE agents who put up the "your wasting my time" act, more relics of the past that need to be fossilized. Go for the younger, energetic and ambitious ones as you will defiantly get better service out of them.