On the Airbus aircraft, they adjusted the pitch on the remaning rows down a bit to get extra room in Stretch. The remaining are 31-32" pitch.

On the E190, to keep under 100 seats they already had a decent amount of pitch, so giving more to the first four rows still leaves decent pitch in the conventional seating.

On the E170 there was less leeway, so they put slim-line seating in the conventional section so the reduced pitch wouldn't be as bad as it would be with regular seats.

So...all three aircraft had pitch reduced in the regular section to give more to Stretch. Not too big a deal on the Airbus, not a big deal at all on the E190, and compensated for on the E170 with slimmer seats.