I spent a lot of my week at Little Lava Lake and it was fabulous. Each day was a little different, but all offered good catch rates and callibaetis fishing. Especially callibaetis nymphs. 
I noticed all 3 days the morning bite was not easy, but by 11 AM until 3 or 4 PM the bite was incredible at times. 
I also noticed another interesting thing when I had my last friends in the boat Thursday, and that is Dan doesn’t like to watch a strike indicator much, and he wanted to try his new Cortland 3 foot Ghost Tip I sold him. He was stripping a Poxy Back Callibaetis on the point and the Callibaetis Nymph we sell from Solitude Flies that has the marabou body and peacock wing case on the dropper tag. 
Charlotte had my Callibaetis Cate on the point and a Poxyback on the tag. 
This is where as an observer (if you are a guide and you are not an observer you are not doing it right) I was fascinated by what I saw… 
The indicator set up had a lot more “bites”, but a lot more misses. The stripped fly set up had less bites, but the hits that came resulted in more conversion to fish to the net. All in all it was about equal to the net, with a slight advantage to the indicator. I think this is true of all lakes and is a trend that can change day by day, and remember there are no absolutes in fishing. What worked yesterday might not work tomorrow. 
Some of my good customers John and Kayana had great success on balanced leeches 2 days in a row. 
My throat pump samples on Tuesday, Wednesday and Thursday indicated the fish were feeding heavily on callibaetis nymphs. 
We also had some excellent sessions on a Quigly Flag Ant and my Jiggy Twist Beetle all 3 afternoons and on Thursday we had Gonzo fishing on a Tilt Wing Dun and Sparkle Dun for an hour and a half near the lunch hour for us. Apparently it was also the lunch hour for the trout. That Tilt Wing Dun is a new one I am trying this year. I’ve had good success with it, it floats well, it’s visible to old eyes and it is durable to many fish in a row. It revives well with Dry Shake too. New flies are fun.