If the stock bushing is already tight and the barrel to slide lockup is nice, adding the accubushing might not give you a significant improvement from stock. Same thing goes with CGWs bushing. If the initial fit is already nice, adding the CGW bushing won’t yield significant improvement as well.
On the flip side of it, if the initial barrel, stock bushing and slide lock up is not great, then adding the accubushing or CGW bushing will yield discernable/significant improvement from stock setup.