Originally Posted by
Maybach
You don't say which 4 day split you are using, but I'm going to assume you're talking about the 4 day TM since you talk about running out a heavy set.
The discussion of the TM is pretty clear that the running out process should be pre-planned as much as possible, not reactively performed when you start missing reps. I'd say you should reset slightly to try and hit 395 for 5, then start breaking it out into triples. It's a done thing to reset a little bit when the rep range changes anyway and you are very close to pulling that for 5 so probably resetting by only two, or even just one week should get you the 1x5.
This is assuming that is the correct thing to adjust. The TM splits represent kind of an increase in deadlift programming from the end of novice programming, and so can be susceptible to overtraining. You can probably get a few more weeks of 5s progress if you started cycling through haltings, rack pulls, and full deadlifts.
What does your volume day look like? Are you doing cleans and snatches for that? If the volume day feels like but the intensity day starts to stall the answer is often to increase volume day pulling. It seems most people find that dynamic pulls stop driving deadlift progress a bit earlier than PPST indicates, especially if they're not especially good at them. You might try adding in another slow pull like an underloaded deadlift variation, or even just volume deadlifts.