>>76352188 (OP)failing on your backoff sets suggests an issue with fatigue, recovery, or load selection. You probably overreached on the top set. If that set was an RPE 10 (true max effort), you may have exhausted your pressing capacity for the session. The drop sets won't perform well after that level of fatigue.
Even in double progression, not every "top" set has to be a true max effort to move up in weight next time. Sometimes it's better to get a clean 6 at an RPE 8.5–9.
also smith benches are a bit deceptive. They remove stabilizer work but force a fixed path, which can fry the front delts and wrists faster. Fatigue creeps in earlier than on free weight benches.
consider lowering the weight next week if the last top set was a grinder. Try reducing by 15–20%, not just 10 lbs. Or switch your backoffs to a more manageable rep range like 6–8 or 8–10 at RPE 7–8. Make sure fatigue and recovery are under control before progressing again.
