Dark Knight Buffing Ideas

Hi everyone, first time posting here. I was reading some other DK suggestion threads and have a few ideas. I'm posting here because I think they are quite different so I'm posting in a new thread. I have a low-level DK and I don't main a DK so please excuse me if some of these ideas are bad or already discussed previously...

Here we go:

1. Zerking: I don't like constantly having low HP and being away from main party and I often feel bad seeing DKs doing so when bossing with them. The recent shad buff gave me an idea. Similar to shad when you get a buff when you stay in DS for 12 secs, what if you get a damage buff for x seconds when your hp dips below a threshold (for example, when your hp gets below 50%, you get a 100% damage buff for 15 seconds, if you stay below 50%, the buff is capped at 15 secs. When you go above 50%, the buff starts counting down to 0. It goes back to 15 secs when you go below 50% again. You get this buff all the time if the boss hits >15k.) This does not eliminate the risk of having to have low hp, but now just not all the time. The bishop can heal you but you need to go low hp once in a while so you still have that risk-factor as the class identity. (By the way, I have a mixed feeling about the recent zerk balance change. I'm happy you still get some damage for going above 50%. I'm a little upset that now some people might expect DK to perform at at lower hp threshold. I know 5 or 10% damage you get going below 50% is probably nothing but it makes the class a little harder to play if you are competitive and if you want to do as much damage as your class/personal skill allows you)
2. Let's make zerk a party buff while we are at it. Of course the number will be adjusted for the team members. It may be similar to dark aura from a later class. Paladins have threaten and Heros have rage..so I think this will be a great offensive party utility for DKs.
3. Defense: DKs can have 30k hp easily so another way to improve survivability is through defense. I think buffing the 2nd job skill Iron Will to provide % damage reduction for the party can do this job. No overlap with bless or other +defense skills. Again nothing crazy on the numbers (like 10-20%?). To balance it out with elemental resistance from 3rd job, maybe just physical % damage reduction for iron will? Heros and Paladins have power guard so I don't think a buff to iron will is too much to ask?
4. Dragon Blood: This is imo one of DK's iconic skills I remember from childhood. Back then almost every DK I walked past by had this effect on them. I like the effect of this skill but sadly it overlaps with attack potions. While I don't want to mess with the attack stat, maybe we can add another source of attack buff to this skill like a small crit (like 5% for +10% damage?) Combined with SE this is like 10% damage buff (20% of 150% damage)? Probably nothing too crazy with the 6% damage buff from SE we have already (15% of 140% damage).

I am not sure if these suggestions are too custom. Feel free to discuss if you have any thoughts on these ideas.