Expansion anchors in slotted holes on steel

Good Evening,

I am working on a project where an angle bracket will be attached to concrete with post installed expansion anchor.
Initially, I wanted to put a slot on the angle bracket for adjustment but as it will be a slip critical connection with slot now, I need to have a minimum pretension of 85kn (CISC) / 19kips(AISC) which comes out to be close to 200ft-lb torque.

As per the expansion anchor technical guide, Torque value is only 80 ft-lb.

I understand that over tightening can cause failure such as concrete splitting as per article by by Richard T. Morgan, P.E.

What should I do? SI there any way to keep slots on steel plate and follow both?
Thank You