Had the same problem the ARP lube you are using is not good for rod bolts.
Molnar sends the Extreme pressure lube #3 with their rods because the arp lube cases friction under extreme pressure you are putting them under that's why the torgue is so high
when I use the #3 lube torque and stretch fall within +- 10 lbs to spec
summit part number
https://www.summitracing.com/parts/hrs-99008

best so far 8.53 @ 158.59 MPH 60'1.240