Re: Salatul Tasbeeh
Peace lilly,
As AA, KKF and many other said earlier. I agree with them that there is no authentic source in hadiht about ‘Salatul Tasbeeh’, and so far I never came across any hadith where it is reported that Prophet Muhammad 
offered it. However, there are various hadiths which states that He :saw: read many rakats (in two = 2+2+2 and so on) like ‘Nafls’.
If one would wish to read then he/she may read it but do not pass it to to others like from ‘Sunnah’ until it is proven.
Almighty Allah knows best.
Re: Salatul Tasbeeh
One of them has an ijazah in Al Bukhari with the shortest chain to the Prophet (saw) and his specialty is science of hadith as well.
Are you trying to say that the scholars I mentioned are less qualified? Islam is MUCH bigger than Islamqa.com which consists of selected fatwas from certain scholars depending on the Fatwas. For example Islamqa ALWAYS quote Ibn Hajar and Sheikh Al Albani but on the issue of Salaatul Tasbih then they censore them because he supported the suthenticity of such an act of worship deeming the hadith regarding it to be Sahih.
You talk about quoting knowledgable scholars then i just need to mention that Ibn Hajar supported this act and that is enough to make you realise what strong support this act has. Or do you want me to give you a vast list of great Muhaditheen and scholars who supported this act if you want to go down that route. Just say and i will give you a huge list!
On top of that as i have already mentioned. The Salaf (Pious predessecors) were on the right path. There is NO denying that. Ibn Al Mubarak was of the Salaf. He supported the authenticity of Salatul Tasbih and actually supported it. Or are you going to say that a Salaf was on the wrong path. Need i say more?
So please learn Islam directly from learned people and not Sheikh Google. Do not become a blind follower of Islamqa.com and know that fiqh consists of many valid differences of opinion but your intolerant attitude shows little knowledge is dangerous knowledge.
Do not be a blind following cut and paste Muslim and learn proper Islam from a learned Islamic teacher and learn the foundations and make your way up to basic fiqh before going into that which you clearly do not know what you are talking about.
Re: Salatul Tasbeeh
Peace Hamza81,
Question is why ‘owners of Islamqa site’ censor the issue/authenticity of ‘Salaatul Tasbih’? May be the chain of narrators are authentic but ‘Salaatul Tasbih’ at itself not authenticate 
Brother, Four Imams of schools of thought said that if someone found in their narrations something that which differ from ‘Quran’ and ‘Sunnah’ then their narrations may be rejected.
Lets say we agree with you here that there is a authentic reference regarding the issue of ‘Salaatul Tasbih’ but I wonder why it is not narrated by Hazrat Aysha r.a. ? 
Although She r.a., mentioned many many time how the Prophet offered namaaz other then Fard namaaz but why not ever said told about ‘Salaatul Tasbeeh’?.
So far I haven’t came across such hadith.