Gonna let you enjoy and explore hbbi, see you in about 10 years time ;)
to spead the process up learn how the akhBari methodology of deriving Ahkam works (حدائق الناضرة).
or just simply go through the istidlal of kitab us Salat.
aplogies for misunderstanding you. Your claim is that it is permissible to add to the tashahud, ( I agree )if so then u must admit that any dua is beneficial to add in. I as a follower of the imams (عليه السلام) would say in my tashahud what they (عليه السلام) said.
Hence why you are following your Aql (you believe in Qiyas?) is your aql better than the imams? Give me what the imam said in his tashahhud and I will do the same. Don’t give me your opinion.
Don’t say the imam told us to say whatever we want, is that the function of an imam? Hmmm? What a great way of honouring the imam (عليه السلام).
how many imams were there?
how many tashahud did they say in thier lives?
if u bring me anything not mutawatir then sorry I’m not gonna say it in my tashahdud. I’m gonna stick with saying THE EXACT SAME WORDS they said.
if u bought a weak Hadith with 3rd tashahud in thier I would recite it. I know they exist and if somebody wants to use that Hadith it’s fine. What you are doing is trying to invent your own methodology.
sincere advice from someone who went down your path, study the religion and don’t be biased. The truth will come to you