I have now been forced to change my perception of the text. Side a is beginning not with heliacal March 22 but with nakshatra September 22. This was my earlier version:

Side a
March 21 (81)	22	23	283	107
l
-	Ca1-1	Ca1-2	390
-	koia	ki te hoea
0h (0.0)	ε Phoenicis (0.8)	Uttara Bhādrapadā-27 / Wall-14
Caph, SIRRAH (0.5)		ALGENIB PEGASI (1.8), χ Pegasi (2.1)
September 19	20	21 (264)
ο Virginis (182.1)	12h (182.6)	MINKAR (183.7), ρ Centauri (183.9)
	ALCHITA, Ma Wei (183.1)

And this is my new version, with 12h at Ca1-1 and September 30 at Cb14-19:

Side a
September 20	21 (264)	equinox	389
Ca1-1	Ca1-2	Ca1-3
koia	ki te hoea	ki te henua
12h (182.6)	MINKAR (183.7), ρ Centauri (183.9)	Pálida (184.6), Megrez (184.9), GIENAH (185.1), ε Muscae (185.2)
ALCHITA, Ma Wei (183.1)

Side b
345	September 28	29	30 (273)
	Cb14-17	Cb14-18	Cb14-19 (740)
	e noi koe te manu - kokoti hia te henua - tagata hakaitiiti - i te henua
	Al Áwwā'-11	β Muscae (192.5), Mimosa (192.9)	no star listed
	χ Virginis (190.7), ρ Virginis (191.4), Porrima, γ Centauri (191.5)

From September 20 up to and including September 30 there are 740 - 11 = 729 nights.

729 = 27 * 27.