Seriously, you don't think I already put enough effort into making the game challenging as it is? Now you're asking me to take away the only alternative attack archers have (eagle eye), when all a player that wants to feel overpowered has to do is turn down the difficulty knob? Please, get real.
From reading your posts, it just sounds like you want to make an obscenely difficult game for yourself, so that it is a "challenge".
I think you need to get a few things straight.
Firstly, master difficulty is difficult enough for most people. This is an RPG, the challenge isnt meant to come from how insanely hard it is to kill something. The game is about the story, your character, quests. That kind of thing.
If you're finding master difficulty too easy, that's just too bad. Either accept that you have "beaten" the game and move on, or reroll another character. It doesnt really sound like you're in it for the RP though. Maybe you should pick an FPS or something, or a different sort of RPG. To be honest, it actually sounds like WoW would suit you. Grind away, fight enemies that are impossible to beat unless you have been grinding for x long and therefore have the mandatory "gear".
Also, I dont buy your whole "err...yeah...my neighbour's xbox". Yeah right. You're just back peddling because you went on a rant about console gamers and then realised the only way you could have been playing Dawnguard anyway was on a console. Unless you live at your neighbour's house, and he/she doesnt mind you having a monoploy over their xbox, then there's no way you've been able to put in the amount of time you're talking about in this thread.
All of that is irrelevant though and beside the point.
The issue you're talking about, you have blown out of all proportion. The crossbow does not fire nukes. You make it sound like it does. Yes, it's better than most bows for raw damage. But it's not loads better. It fires slower. Yes, overall I still think it does more damage, but not that much more. Your game isn't breaking because of a crossbow.
If you're still seeking something so difficult, and you really hate crossbows, then I really think you need to focus on mods.