I find this an interesting debate, I have shot the original Power Blues and have not found them to be excessively punchy !
We all have different comfort thresholds for managing or esperiencing the effects of recoil ,so it is very important to find a cartridge that you like and does the job for you .
Express famously made a cartridge that was adored by Trap shooters, Express World Cup. I only had to shoot a box of 25 and they gave me a headache .
Hull manufacture the CompX in variuos shot loads from 21 gram to 28 gram , all super soft and comfortable to shoot , but they have never filled me with confidence , even though I break clays with them I just do not feel comfortable with them .
I do have to comment that Lyalvale Express have always had a (bad?) reputation for manufacturing thumpy cartridges , but there is a young Hampshire lad who never seems to complain about them , and he gets the job done .
Maybe , due to the problems we are having with imports from Europe the cartridge manufacturers can not always acquire exactly what components they want from the Italian / Spanish manufacturers so they may have to mix and match components to satisfy production runs, and remember the customers will never know as they are gullible enough to put up with price increases for no apparent reason, so what they don't know will not hurt them although the recoil might.