The Hoor, or as u said houris, are creatures of Heaven.
They were created for a certain men;
Verily, We have created them (maidens) of special creation. And made them virgins; Loving (their husbands only), equal in age. [Sura Al-Wâqi'ah (56):37-40]
So a hoori who is one of the delights of Paradise, she has only been created in Paradise for the sake of someone else, and has been made the reward for the believing man for his righteous deeds.
If you agree that if something is suffering doing what it was created doing then perhaps you should consider saving all the angels too. And animals. People. Rocks. Water. Earth. Sun ... actually go save every created thing while your at it.
No. It doesn't add up. Everything is created for a purpose and the hoor are a reward in paradise. Simple.