-attk/+hp hector worth keeping?

Even a -attack Hector is better than none, and if you don't have a lot of good green units, or if you have an armor team that needs him, I'd keep him. If you don't need him, then you can throw him away

Like the other guy said, any Hector is better than none. A simple attack seal would patch him up.

I have a Hector (my only one) with these IV's and he's not that bad. With 55 HP Panic Ploy activates most of the time so you can counter a lot of enemy teams.

id immediately say give it to chrom or keep him and inherit bold fighter onto him

The short answer is no.

But I still suggest keeping your Hector for another while. There are several reasons. 1) First of all, you can get 4k feather from each hero you collect. Probably more over time. Hector can be used for a lot of situations. You won't have trouble accumulating those feathers. 2) With Lissa and Chrome (what IV? not all Lissa or Chrome needs DC), in the long run, you are unlikely to need an unmerged Hector in your armor team regardless of whether you need it to score or just form a component in AA. But if your resources are still thin, having another unit at your disposal -- albeit with handicap -- is more important than improving a single unit. For example, -Atk or not, Hector will counter Reinhardt with proper Ward Armor support and/or Panic Ploy. Your main concern is lack of Res. +HP actually helps you survive unbuffed Reinhardt. (Buffed ones need be debuffed with Panic Ploy.) +HP also helps you apply Panic Ploy on armor units. 3) Your potential inheritor units seem to be under-invested -- too under-invested to justify the application of such a premium skill. We all have limited orbs and we all want to collect heroes -- leaving little resources dedicated to skill farming. If you are even asking this question, it seems unlikely that you can pass on DC on the whim. You want to think through the utility of sacrificing Hector for DC. That is obviously not helping you to collect more heroes. When you strengthen a (single) hero, why? Out of love? If that's the only reason, yes go ahead. Like actually. The satisfaction you can get from building your favorite hero ever closer to his/her ideal can outweigh all things else. Want Arena/AA scoring? Then you need +10. You are only investing premium skills on units you plan to +10. For your AA bench? Then you don't need your unit to be perfect. And thus giving DC is a non-starter.

I hope that clarifies things.

Now, I have noticed so many comments insinuating somehow seals patches bad banes. That's just bad logic. If you are dealing with PvE maps, minor handicap on a single unit just doesn't matter. "Patching stats" is meaningless when the handicap itself is meaningless. If you want Arena/AA use, seals don't patch stats because either you need other seals for scoring and actually winning or you face opponents who are higher merged and/or similarly have seals. It's just naive to assume your own seal is somehow not countered by other units with good IVs and seals. It's mystifying to me how the above is not obvious.