Crit & Attackspeed build

Unfortunately, I don't think you did the calculations, and you're incorrect. I'll elaborate.

Yes, instead of Heim's basic non-DB crits doing 100% extra damage (or a 2x multiplier), HR reduced this to 70% (or a 1.7x multiplier). They absolutely had to do this in keeping with his multipliers, otherwise crit would be completely broken on him. As an FYI, DB on Heim adds 30%, which means (I believe) this would be 70% crit + 30% crit = 100% extra damage, or a 2x multiplier).

That said, given a base damage number, a crit with Heim is going to deal more damage than a crit with any other hunter.

Heim's attacks 1 and 2 have a 1.3x damage multiplier. Attack 3 has a 1.5x damage multiplier. I've put this into a spreadsheet so you can see the calcs. It should be pretty straightforward and easy to understand, but if you don't, I can attempt to explain further.

Basically, take the base damage, multiply by the basic attack multiplier (1.3 or 1.5 for Heim, no actual multiplier so "1" for any other hunter outside of Iza, then multiply by the crit...with or without DB, to get the total damage.



At a base damage of 100, a first basic from Heim deals 221, compared to 200 from another hunter. As the base damage increases, the difference in damage per hit also increases. At a base damage of 250, a first basic from Heim deals 552.5, while it's 500 for another hunter.

Crit works on Heim.

"Full damage" is a bit ambiguous

Agreed again, Raven.

All 3 builds are not optimal.

• Most crit builds should avoid items with 0 power, because crit damage scales directly off of power, not attack speed. Build 1 and 2 incorporate O-Bow, which has 0 power.
  
  
• I'm fine with Ninja Tabi. Heim's AS is very slow as-is, so a bit of AS here and there is helpful in a general sense.
  
  
• In general, I believe power should be emphasized over AS, because that first hit of Heim's (which you can attack cancel with to increase DPS) hits at 1.3 damage. This means the base power items are amplified in damage. It's okay to build AS, but it shouldn't be at the detriment of power. If anything, items like Ichaival should work well for him.
  
  
• Example 2 only has 1 crit item, and also adds Qin's. Qin's and crit items aren't synergistic...that doesn't mean they can't be built together, but when you build into crit, you sort of want to prioritize getting that online. That example 2 really should drop O-Bow. It should also delay The Executioner, and prioritize at least some early flat pen. If you do in fact build into Qin's, you might consider it as Devo's, Ninja, The Crusher, Exe, Qin's, TB, replace Ninja with whatever (but not O-Bow). But again, I think the better direction is power more than AS.
  
• Example 3 rushes shoes instead of stacking, then builds immediately into Exe (which is again too early if you understand how % prot reduction works). Then it rushes straight into DB, followed by Wind, Qin's, and Asi. DB is almost always best as the 2nd crit item. If you do build this crit direction and use The Bifrost to get back to lane ASAP, you can probably avoid early lifesteal if preferred...so, Hunter's Blessing, Warrior Tabi, Rage, The Executioner, Deathbringer, Ichaival + Bloodforge in whichever order (or Asi if really preferred), replace Warrior with whatever. Don't bother with Qin's, in all honesty.
  
  
• In the end, I just don't think Qin's Sais is optimal for him. His kit works against it just with his attack progression slowing things down, and not having an AS steroid.

As such, can't really suggest/support any of these builds as they currently stand.