It seems to me that I can do 3 sets of C+J and recover <134bpm (my Maf and talk test are about here). I started the 4th set at +-136 bpm, and it goes off-track from there. Then I took a 2 min break and able to repeat it almost exactly as described but 24kg Clean -> 4 sets +2min rest -> exactly the same HR results -> and I swapped between the 16/24 for each cycle of sets for a total of 5 cycles. here is my HR report (the first 5 min was warmup). my gut feeling is that it was day 1 after 2 weeks of every-45s so my body had a shock, and I will quickly extend from 3 to many E30 sets before failing the talk test....actually, I've been doing every 45s for a very long time on various tricks (e.g. 8 x 24kg swings E45 on the easier days...10x1H for 100swings untimed = the moderate days).
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edit: I do try to jerk with the 24kg, but only get to Jeeeerrrr
the KB bounces up a few inches from my rack postion and have not yet tried to power it up with my arm like a strict press.