Yes, I did acknowledge at the start of my last post that you had previously said you were going to consider your role. So don't think I'm trying to attack you or anything; you've asked for help and I'm reflecting back what I think is your son's perspective.
Wrt to safety cuddle thing, yes, it's about changing your tactic, but I'm referring more to the underlying causes of the problem - safety cuddle on its own implies that the problem is your son's anger. I think something else is causing the anger, and perhaps you need to give us more background information if you want help working that bit out? Unless he is a child with 'abnormal' behavioural or developmental issues requiring professional support (and you haven't indicated this) it sounds like a fairly normal family situation which has got out of hand.
Fantastic that you have How To Talk and you find that it works. Although you said you feel like when you use their techniques you feel that he's walking all over you. You also said earlier that you're usually 'placid' - which sounds like you're not being firm. Perhaps that's one part of the problem. Reading between the lines I'm guessing that your DH is towards the other end of the spectrum - more authoritarian, perhaps. What do you think? If so I'd say that you both need to come somewhere nearer the centre. What can happen when one parent is 'soft' and the other is 'hard' is that the child basically bites back. It's confusing for the child, and overwhelming at times, and also they know that they can get away with certain things so they try and push those boundaries.
In a way I think we could have allowed our family situation to end up deteriorating similarly to yours, because I recognise some of what you're saying - excessively elaborate bedtime routines, etc. It comes to a point where your child is taking you for a ride, but from experience I would say that's because you've allowed him to. This is why I was suggesting that you reflect on your role first, and I think your DH is right to refuse to comply with this bedtime routine which you've instituted - it is ridiculous, and unnecessary. I say this not as a criticism, but from experience! You need to tell your DS that you are going to bring in a new and improved approach to bedtime and discipline/ whatever. If he asks why, it's enough to say 'because I say so'. Surprisingly, most young kids seem to accept this!
With us, once we realised that one parent was inadvertently perpetuating the absurd bedtime situation (I won't say which parent it was !
) we started to work out who was going to be the best person to sort it out. The approach we used was quiet but firm. No engaging with the problem at all - whatever our DC said to try and get one over us, we'd just reply 'It's sleeptime now' and ignore all the other crap. It seems to be working so far...
IMO it's worth both you and DH trying 'How To Talk' with a 'quiet but firm' approach. It sounds as though both of you are losing control in different ways, and feeling lost and helpless. 'Quiet but firm' helps you to keep control of yourself, which means you can think more clearly in the situation and you should be able to handle it better. Then, as you know, How To Talk will give you tools to manage your son.