Everlast PowerTig 210EXT maximum AC output amp

[Ultraman]

Ok, I just bought the digital 210EXT and I am finding out that maximum amps in AC is only about 150 even though the digital readout says 210. I have a clamp meter (Extech 623) and this is what I got:

10amps .. 10.2measured
30amps .. 26.9
50amps .. 44.1
70amps .. 57.9
90amps .. 71.0
110amps .. 85.1
130amps .. 98.9
150amps .. 112.9
170amps .. 126.7
190amps .. 140.9
210amps .. 154.7

wall outlet: 240V
AC freq: 150Hz
AC balance: -30% (80%EN)
wave form: adv. square
pulse: off
electrode: 1.5% lanthanated (3/32" 2.4mm)
argon: 15cfm (victor regulator)

Hidden menu setting:
D02: 0.5sec
D03: 100Hz
D05: 40amps

I put the torch on a fixed clamp with arc gap of about 1/16". I tried torch switch and foot pedal with similar results. At maximum, I can barely start the puddle on a 1/4" AL plate. Is there more settings inside the machine I need to check?

What is going on??? On DC, maximum amp I measured was 201.0 so It's close enough.