I get a more penetrating trajectory with the (NS Pro WV 125) Nippon 125 Wedge Shaft over the DG Spinner on full shots. Wish I had both shafts in a similar head so I could give a good comparison on short game spin. I may prefer the Nippon. The Nippons are in a non-conforming Vega Set, and the DG Spinner in a Miura Conforming set.
In my irons, I play an Aerotech i80 senior flex.
I play a DG Spinner Wedge + in my Gap, and Wedge in the 55 and 59. You can handle it. You want accuracy in your wedges, not distance, and the heavier shafts will generally be more accurate.
At the same time, I had the same qualms as you -- thought 105g in a gap would be better, and heavier shafts in the higher lofted wedges. But it's fine.