I'd definitely recommend another wedge, 52° or 58/60° and maybe a 3 hybrid 19° to fill your gapping between 3W 16°, 5H 22°.
But without a good range session to get yardages you won't really know.
Just looking at the 921 they're quite strong lofted so possible it's the short end to look at depending on your distances.
Yeah, I recently picked up a cheapo Slazenger 60 degree wedge and I love it I'm no great played but if you're not far off the green with a bunker or something in the way it's great to have the confidence that the thing is gonna go sky high, and just stop when it lands. I hit it maybe 35-40 yards max but it's such a nice feeling when you hit it, kinda weird really...
Played 18 holes today, local club so no buggy but nicked a mates trolley (just a basic two wheel manual one, and my bag didn't really fit great being a stand back) which was way nicer than carrying the clubs... Hit some good shots and some absolute stinkers, 122 overall which is 'ok' for me, certainly not a good round though.
Definitely noticing the change in the course though, especially as I started at the tail end of the heatwave/drought period it makes everything way longer when the ball just stops when it lands