For reference’s sake the last time I did these with regularity I was probably deadlifting around 565. I don’t think I ever did a set of RDL’s over 225.
This is an exercise I always tried to do with very good form, controlled tempo and a weight heavy enough to stimulate. It is assistance, not a main lift, and nobody cares how much you can RDL.
If you’re already topping out at 135, I’d encourage you to progress slowly and sensibly. Nothing wrong with 5 more pounds than you did last week. If you’re running CT’s program, you’re shooting for a weight you can complete the set/rep scheme he lays out without form breakdowns while still being challenging.
I’m a big fan of RDL’s. Great way to learn the hip hinge.