Iota converters have their 14.8 but they say that is to get the batts to 14.6 before the Iota drops to 14.2 for the Iota Vabs.
The battery voltage will eventually be very close to converter voltage once batteries are full, but I meant that if you want battery voltage to be at 14.8 from the beginning of the Absorption Stage, then converter Vabs needs to be higher than 14.8.
I an unclear if Trojan wants that or just for the batts to reach 14.8 by the time they are full and then go to Float.
I use short fat cables converter-battery and you can see the spread between converter and battery voltages during Bulk and then during Absorption in those ugly graphs. I got the same with the Paramode converter I had. So I don't think it is some sort of wiring issue why there is such a wide spread in the voltages, but anything is possible in this business :)