I have learned that there are significant differences between the videos I have seen on Shi'a salah as compared to what I have been practicing as a Sunni, following the Shafi'i Madhab. These differences include: combining prayers, prostrating on a Turbah (prayer stone), not saying Ameen after al-Fatiha, the recitation upon standing from Jalsa, different words in Tahhajud, saying SubhanAllah, Al hamdu lillah, la ilaha illAllah and Allahu Akbar 3X in 3rd and 4th rakats instead of al-Fatiha, saying salam once straight ahead instead of to right then left, and 3X Allahu Akbar to end salah.
I have similarly recognized differences between the 4 Sunni Madhabs and chose the Shafi'i as it seemed to me the most authentic as being based on Hadith collections..
The questions I have are, "What is the basis for the Shi'a way of offering salah and why is it significantly different?" Is it based on Shi'a collections of hadith or passed down by word of mouth and demonstration? Should we not follow the way that Prophet Muhammad (saaws) prayed as closely as humanly possible?