And with respect to the bottle, where does it say it was made? If in the USA, the HC-110 probably won't exhibit the legendary longevity of the old HC-110. There are other threads though that indicate that they are getting reasonable longevity.
I wouldn't swirl beforehand. But I also wouldn't change your agitation.
By the way, my experience with various dilutions of HC-110, used both one-shot and with the no longer made replenisher, is that it isn't a full speed developer. If you normally expose your film at the ISO speed, give it 1/3 a stop more instead.
I was just reaching for the bottle to drop it in the bin but I will give it another go, and I will use the datasheet as a starting point and add 10% for good measure. The ring-a-round is a great idea, but I won't be buying any more Kodak HC110, and, knowing my luck, I will nail it with my last drop lol. If I want 110 again it will probably be the Bellini, although I do like Adox products and love their FX-39 ii


Peter