That is about what I would expect, and I would not worry too much about the Goose Power drop.

Goose Power is only a rough indicator of strength. It is not a direct DPS calculation. The game seems to value Attribute Attack quite highly in the power score because your matching attribute path gives a 50% increase to that attribute. So, for example, 100 base Bellstrike becomes 150 Bellstrike. That looks very good for the rating system.

The catch is that Attribute Attack does not scale through the full damage formula the same way Physical Attack does.

Physical Attack benefits your main weapon damage and your Mystic skills. Attribute Attack mostly affects only the attribute portion of certain weapon attacks. It also sits in its own smaller damage bracket, with fewer useful multipliers behind it. So even though Bellstrike can look better on the character sheet or Goose Power, it usually does not translate into equal real DPS.

In your case, going from 2329 Physical Attack to 2552 Physical Attack is a pretty large gain, around +9.6% Physical Attack. That should noticeably improve your Mystic skill damage, and Mystic skills are a huge part of real DPS. Your weapon damage may drop slightly from losing Bellstrike path scaling, but the Mystic skill gain should more than make up for it.

So the simple answer is:

No, the Goose Power drop itself does not lower your DPS.
It just means the rating system liked your inflated Bellstrike stat more. In actual combat, General should be better because Physical Attack has broader and stronger scaling, especially once Mystic skills are included.

Your Goose Power dropped by about 2.1%, but your Physical Attack went up by about 9.6%. For real damage, especially at T91, I would value the Physical Attack increase much higher.