Tracking arrow, like an arrow with a tracking beacon head that adheres to solid surfaces and the shaft falls away. For vehicles mainly but i suppose you may not feel it through power armor or something.

Injection arrowhead, similar to the penetrating arrow type as detailed above, but once in penetrates it injects a high pressure gas, dealing extra damage, even more damage in a vacuum environment.

Liquid Nitrogen Arrow head, can freeze liquids as well as dealing extra damage i suppose, but yeh Arkham City style.

space blanket said:

I like the first, not quite sure about the two others though

 Just as both an avid hunter and target shooter and a hobby archer, I would not give it the Accurate quality. I know a man who put an arrow through a ping pong ball at 60 yards, and he is damned good with a 900 dollar bow. As a none-too-skilled shooter, I can put a bullet through that ball every time at 100 yards with a Marlin XL-7 (granted, while prone and taking my time). This doesn't even take into account the incredible difference in things like wind, drift, time to impact, etc which all make a rifle far, far more accurate.

The reload time is a bit of an issue, but I wouldn't cap it at a 1/2 action unless he needs to attach arrowheads individually, which would take more time. I would also consider allowing him to apply Swift and Lightning attacks to the bow, provided he stays stationary and uses a full action, but this is akin to having the arrows in his left hand while he draws with his right (I have seen that man I mentioned fire 3 arrows in 3 seconds. Damn impressive).

For arrowheads, just make them all mini-grenades, with certain specialty tips. Don't reduce damage, but drop the Blast radius by 1/4, if not 1/2 to reflect the lack of the actual mass of the tip. 

If you wanted realism, I wouldn't bother with the increased SB thing. The maximum tension at which you gain a tangible benefit to the power per lbs-pull is 65-70 on a recurve bow. If you bumped it up to 100, you may get a benefit, but it's an inverse exponential curve in terms of strength over tension. Cap it at about 1d10+5 base damage for your AP arrows (grant them tearing when Best Quality, perhaps?) and simply have it be Personalized, with a maximum range of 40 meters. Since the maximum range is iirc 4x the base range, 160 Meters is very, very generous without having them be rockets.

Well hawkeye maybe good but there are better and older.

Try Justice Leauge series(from season3) the Green Arrow (Initiation episode).

And Yong Justice series for Red Arrow and Artemis.

You will find plenty of concepts, inspiration and help in there.