Jim, although I agree with your first sentence and last sentence, I think you are sending Joe down the wrong road here with the shaft/groove bits.
Sure, shaft type and grooves effect distance, but I think Joe simply doesn't arrive at a solid impact condition. I'm sure any quality striker can hit any wedge of similar loft and shaft length within 5% of normal distance, with the 5% accounting for shaft and spin.
I've seen countless guys who flip wedges and hit them high and short and they would do it with any wedge I put in there hands.
IMO, Joeparr would be best suited at taking a look at his impact conditions. I bet the shaft is verticle and lacks a reasonable amount of forward lean.
I agree with your post, i was just giving various reasons. Notice the first thing i said was that "If you are creating more loft on the club and spinning it too much it won't go anywhere." This relates to what you are talking about.
However, as a comparison:
My custom made 58* lob wedge with aggressive grooves, and a softer tip shaft to deflect more to aid in launch/spin goes about 80 yards.
My Callaway MD groove 58* lob wedge with even MORE aggressive grooves, however with a dynamic gold S400 shaft (much stiffer than other lob wedge) i can get to go about 90 yards as the S400 flattens out the flight enough.
Both were bent to proper loft too.
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But as you say, most likely it's impact conditions.