@jef, a few thoughts in response to your post - forgive me if this is too lengthy. Let's start with that your weight and my current weight are the same, 68 kg.
So much of appropriate, result-producing programming depends on how strong you are in general, how strong you are at each individual lift you're training, and where you are in your life as lifter.
E.g., I never did the ROP with 16 kg - it's just too light for me. No insult intended towards you, of course, but I need my numbers to make the point here. Had I done the ROP with 16 kg, I could have done just about anything on variety days and it would have worked out fine.
The same is true of the deadlifts. 115 kg is about 255 lbs. - that's a weight I can deadlift anywhere, anytime, and whether or not I've been training my deadlift. So again, for me, variety day deadlifts at that weight wouldn't adversely effect a pressing program or any other program.
The devil is in the details, which is why mixing programs is tricky business. You picked light weights, relatively speaking, for both parts of the program, so combining them worked. Had you gone heavier with either your presses or your deadlifts, things might have been different; we don't know where the line would have been in your case, but you can rest assured that, if you'd crossed it, you'd know it.
I hope this is helpful to someone - not intended to rant at your or anyone, just trying to make the point that, when we read about someone successfully combining programs, we need to know that we are not them and they are not us.
-S-