when killshot camera happens, the paralyze effect still applies before the arrow/bolt actually hits
when it's normal attacks, all is ok
can you fix it or may be I failed in some ways?

At last! I never realized that my bow was causing this annoying problem. It's been bugging me for months and now it's fixed (Used LOOT and it placed it last in my load order). Brilliant! Thank you so much!

Does this fix the problem with people dying stiff?

Lazy ass bethesda, why does effect apply as soon as you release the arrow instead of waiting until the arrow actually hits your target!

handy because i hate it when the weapons float when i sneak attack them with my one-hit bow :/

Not a lot I can do then I guess, even with your mod being last ?

Shame, I guess I'll just have to live with the floating weapons... Oo

Looks like it could be some sort of imcompatibility with that mod. It makes changes to archery that might effect this one.

I use ACE mod from nexus... because of that mod I was led to use yours.. :)
http://skyrim.nexusmods.com/mods/10037

I have your mod right at the bottom.

Do you have any other mods that affect perks or paralyze in any way? is this one loaded last?

Yeah still happening, a marginal decrease though.

How would this vary depending on system ???

Its possible the 0.1 delay may not be long enough for some systems. It fixes it on mine though.

Still have the bug present, I try and re-arrange the mods placement in the list and see if it makes any difference.

Thank god for this, I use ACE and with my sword or arrows I am seeing weapons 'all' the time freeze in the air.

Testing now.

i am an extreme archer (it means im a very well made archer character that doesnt use any other weapons) and i never notice how much this problem occurred until i saw this and tested your theory. It was true and it began to annoy me how they froze. So i got this mod. I hope it works. That is all.

It might fix this problem. the way the script works is the paralyze spell is applied by 0.1 seconds after the arrow hits,

And yes, I do think it was introduced by the USKP. I've posted the problem and this fix on the USKP bugtracker

(Combining two comments)
1. Does this also fix the paralysis taking effect even if I miss with an arrow?
It's those damn killshot camera changes, they break archery badly.

2. Wasn't this weapon problem introduced by the Unofficial Skyrim patch? Normally these weapons would fall down, but USP prevents enemies from dropping their weapons.
If so, this is a bugfix solely for USP and you need to mention that prominently in the description.