You haven't played a type of war world late on. World 12 was mainly won through recruits and eating up the smaller players. No offense to DNY at all they did a great job no matter how they did it. However take for example world 10. We have difficult front lines. The HC nuke is a tactic used by all front line players so offense can also defend through sniping nobles.
Yes, I think you will find that I have played a war late on. In fact, I have played 2 wars with accounts 3 million points plus. One of them was vs DNY on W12. I will tell you now that you are clearly very misinformed if you think DNY won W12 through recruitment, they didn't. The reason they won was because the core membership group destroyed tribes and recruited their best. Why would you have a tribe on its knees, then munch away on all its villages. Its much more advantageous to recruit their best.
There may be only 20 levels of wall but when trying to break through defenses of 1 mill sp and 1 mill sw 200 rams wont scratch the wall. You need 300 and you need many of those nukes not just 30. You need 500 in that category.
Dude, are you trying to tell me that you've face 1 million spear and sword stacks? Never, on any .net world or .uk world have I heard something so ridiculous. Thats called
over stacking, you don't need that much defense in there. The max stacks I have seen are 300K of each and thats the main target village. Give or take a few for luck but that stack can take 45 nukes. You don't need any more troops in there its ridiculous as the defense can be used elsewhere. As for the 500 nukes, I would like to see you have 500+ offensive villages let alone all those being wall breaker. My standard nuke is 300-320 rams setting dependent and I have 700 ram nukes mixed in to take chunks out of the wall, that is a wall breaker nuke. On W12, I had 800 villages. 450 O : 350 D. It was an 8 million point account, I played to the end of W12 for nearly 3 years yet didn't have 500 nukes.
The reason you haven't seen a LC and HC combination is mainly because you have seen worlds with 15 level tech. When you have the simple tech system you can afford to have a mix of troops a lot of newer worlds have simple tech system.
If you actually ask me what worlds I have played, you will find out that I have played every type of tech. W41 I played to 3 million points and that was a 15 tier tech system. I say ax/hc and ax/lc nukes there all the time. However, whilst there I identified that if your sniping, its irrelevant what troop you use, and, by looking into it 3.2K lcav and 1.8-2K hcav are very similar defensively. As I said earlier, what nuke you use is all through personal preference. As for the simple tech worlds, I played W49 and that was simple tech's, again, I didn't see a mix of lcav/hcav there either. The point is, that its stupid. You need strength in numbers. And sniping with 200 hcav and 500 lcav wont do it when people split their trains. You need to make a decision. 500 hcav + or 1000 lcav (numbers taken into account through split train sniping method)
I do hope that answered any questions you had about favorable troop counts.
Personally I use:
Archers: 0,0,6412,50,3000,0,300,25,0
Archers: 0,0,6226,0,51,3000,200,0,250,25,00
[EDIT]
As you can see, its a balanced nuke, that can changed dependent on the situation. Hope it helped.