Careful there Sharpshooter, "no pulse" is not anything to look forward to.

Just for grins, try using something like Elmer's glue to attach a 3/8" washer to the rear sight to make temporary forward peep, and see how that works for you. Use a large target and don't worry about placement on the target. Just see what kind of groups you get. If that works it wouldn't be difficult to permanently modify the rear sight to a big hole peep.

I've always found it difficult to get good groups with hefty charges of T7, and usually default to RS or GOEX. Is T7 what you were using in prior shots with the gun?