NTK AFRM setup offset and injector dc questions

[n_brio]

I have just dailed in my VE tabel and the car drives awsom and i have started to tune the boost VE

My car is a 2005 corvette c6 with supercharger on e85 2 bar SD OS
forged ls2 cr 10:1
small blower cam
1 7/8 ARH 3" catless
stock heads
ECS 1500 SC no restrictor 16 PSI boost
return style fuel system walbro 450 intank and a1000 that starts in boost, ID 1000 injectors stock fuel rails

1:

I use this equation for my NTK wideband in hp tuners

(volts /5,33) + 0,526

then the reader and the hp tuners shows the same at lambda = 1

i should be using this formula:

VOLTS / (4/DEVICE RANGE) + (MINIMUM VALUE OF DEVICE) = LAMBDA

volt 0,4 to 4,5
lambda 0,62 to 1,37
afr 9 to 20

but why do i have to adjust my offset to ,0526 insted of 0,62 ??


2:

At WOT i saw 120% DC but my lambda is ok i know that maby my injecors are to small but shouldet ID1000 whit my fuel pums in a return style system be enough? and if i have 120% DC shouldent my lambda be off after like 100% dc?