How far did you insert the blower nozzle? Also, one shouldn't blow around the sensor ever. A person should just insert the nozzle tip right at the mount point, maybe a tad farther, and blow the sensor only. There lubricants and other material around the sensor, and they risk blowing small droplets back onto the sensor, thus requiring a wet cleaning. I am sure you did this correctly (4 puffs, only at sensor), this is info for others that may have never used a blower, then read this thread only to walk away thinking a blower is not appropriate, when in actuality it is.
I have used a blower on 10+ different bodies and never had an issue. It always cleaned off the dust. It appears to be droplets in your sample, perfectly round and small. Dust particles are usually not so perfectly round, especially at f11. Somehow something foreign moved from the surrounding area and landed on the sensor. If another few bursts won't dislodge these, it adds credence to the fact that this is probably a liquid of some sort.
I did just hold the nozzle at around lens mount level. That's why I'm so annoyed with the outcome. I didn't just slam into this willy nilly, I read about the perils and pitfalls and made a good effort to avoid them..... Will try another few blows and see if the original specs are in the same place to confirm or refute the liquid splash idea. Hell, sod it, I'm off to get my jet washer, that'll shift it!