QRDude is still a couple of weeks from release.
Moving to your B option is OK
N23 N11 N23 N23 is still a valid Barker sequence (you can run the sequence backwards)
To get the benefits of multiple panels of the same order adding together to give more effective diffusion, you would want them all to be the same.
This means all the N23's should have the same amount of left shift as each other, and none of them reversed.
The main reason emphasis is put on having a zero-depth well at the left end is so that you can move one half well to the other end.
If all your panels are built this way, they sit together nicely.
To achieve this, you would need to build the centre N23 as a full unit, and the N11's as separates.
This would look like:
The N23's:
Data for One Dimensional QRD (Quadratic Residue) Diffuser
Standard N23 Panel
Design frequency 994 hz
Number of wells: 23
Deepest well in mm 135
Fin width in mm: 2.5
Width of wells in mm: 40
Ratios 0 1 4 9 16 2 13 3 18 12 8 6 6 8 12 18 3 13 2 16 9 4 1
Well depths in mm 0 7 30 67 120 15 97 22 135 90 60 45 45 60 90 135 22 97 15 120 67 30 7
Phase shift in degrees 0 15 62 140 250 31 203 46 281 187 125 93 93 125 187 281 46 203 31 250 140 62 15
LF cutoff frequency 497 hz HF cutoff 4300 hz
Panel width 977.5 mm
Minimum distance to seating position 2076mm (3 times wavelength of LF cutoff frequency)
The N11's
Data for One Dimensional QRD (Quadratic Residue) Diffuser
Custom N11 panel: Shifted down 2 depth units and left 3 wells
Design frequency 811 hz
Number of wells: 11
Deepest well in mm 135
Fin width in mm: 2.5
Width of wells in mm: 40
Ratios 0 7 5 5 7 0 6 3 2 3 6
Well depths in mm 0 134 96 96 134 0 115 57 38 57 115
Phase shift in degrees 0 229 163 163 229 0 196 98 65 98 196
LF cutoff frequency 405 hz HF cutoff 4300 hz
Panel width 467.5 mm
Minimum distance to seating position 2544mm (3 times wavelength of LF cutoff frequency)