LM317 maximum current output as a voltage regulator
Turns out it was the model I used had a cut off at 840mA.
After I tried a LM317.SUB from someone else, it started to cut off at around 1.4A.
The &quot;working&quot; .sub file has the following changes than the one I previously used:

R26 32 3 .06
.MODEL QNL NPN(EG=1.22 BF=80 RB=100 CCS=1.5PF TF=.3NS TR=6NS CJE=2PF IS=6E-16 CJC=1PF VAF=100)
.MODEL QPL PNP(BF=40 RB=20 TF=.6NS TR=10NS CJE=1.5PF CJC=1PF VAF=50 IS=6E-16)

Note, the smaller R26, the higher the cut off current it will get.