Troubles with Doom

I've been playing an increasingly high amount of doom lately and running into the same frustrations. I farm up midas, phase boots, vangaurd, and radiance aroudn 20 minutes and generally crush from that point on. However, if I don't win by around 35 hard carries with minimal builds seem to be able to convincingly crush me no matter what items I get. For example, I went 15 - 3 with doom getting vangaurd, haliberd, radiance, blade mail, and phase. A pretty expensive build considering with around 2k in the bank trying to figure out what the **** to build. And a naix with Abyssal and armlet rapes me convincingly. Heroes like naix and lycanthrope seem to be impossible to fight late game regardless of what I decide to build. My question being, what is your opinion on ultra-late game doom viability and what build do you think allows doom to carry harder in late game. I have this idealistic theory that if I farm up around 10k in items I should be carrying harder than life. Help! <3

Doom 30-35
Anti Mage 45-55
Specter 50-60
Faceless void 60-65
Lone Druid. 70+

This a time table I made from my own experience. Each hard cary has a window were it peaks. What makes doom good is his ability to farm. He comes online faster than any one else. That being said he is not the strongest. When playing doom you normally have to win by 40 min or you lose the game to other hard caries.

you mean minutes?

That's untrue. If you keep your 35 minute build you will lose later, but if you slowly upgrade your build, incorporating things like Shiva's, Assault Cuirass, Heart of Tarrasque then you should be potent as many other carries, Doom has crazy STR gain and has one of the most powerful ULT in the game.

Of course you'll lose to a hard counter like N'aix, but against AM and other similar carries you should still be a huge presence especially if you're using Halberd.

There is way more to consider than just minutes. You also need to realize that each carry does something different. Spectre doesn't carry the same way Anti-Mage does. She is a teamfight carry. Also, Void's can peak out at around 35-40 minutes if they are farming decently.
Edit: And I also disagree with Lone Druid being "70+". He is a mid-game carry that can push like the dickens. If you're trying to wait until 70 minutes (keep in mind that 95% of games don't last that long) then you are playing him wrong.

You missed Phantom Lancer 14-70+

I really like Doom's farmability but if he drops out at around 30 minutes then what's the point of him as a carry. Even if you get radiance at 20 you have a 10 minute win condition limit. That's insane. My current build is just Wand -> phase -> vangaurd -> radiance -> bkb and halberd and heart situational. Should I be trying instead a shivas and ac build?

You should be swapping out Vanguard and Wand pretty quickly after. And situationally an Aghanim's or a Refresher. Doom's weakness is his extremely low armor, a choice of Shiva's or an AC is a common pick up to fill this, or respectively a Blademail.

you seem to be doing great with doom. Your GPM is high and your build sense seems good. Why not just play a hard carry? AM with that amount of GPM can carry early game with a manta. I carry bad teams with my SS and QoP and they are intel heroes.

You need to have a heroes with an escape like qop , ss , am , weaver, good GPM and good items. A 60 min SS with blood stone, orchid, sheep stick, and crystal will be just as devastating than doom in my option. And on top he has an escape, so if you over play your hand (it happens to the best of us) you can recover with out loss of life.

My train of thought in my time table was not when they become effective but when they have trouble becoming more effective. Doom and Anti mage can farm faster than spec and void but spec can gain free assist early and mid game. I also said druid as 70+ not saying he useless before that his split push is absurd, but that is when he reaches max power.

From my experiences doom's power comes from items so his 100 gold every minute or so allows him to get up items before the other heros. That being said he will usually lose to another farmed hero if both have there full 6.