Ibnu Taymiyyah

Q: My question is pertaining to Ibnu taymiyyah. He is someone that deemed the Mongol invaders of the Muslim world to be non Muslim as they didn't rule according to the Law of Allah, he didn't say the same though about his own rulers even though they were not exactly entirely applying sharia and he was loyal to them and never instructed jihad against them. Did he do so on the grounds he thought it is wrong to fight the ruler or did he not deem his rulers as non Muslim in the same way he did the Mongols and if so why didn't he deem his own Mamluk rulers also non Muslim for not ruling by the Law of Allah?

Forgetting when delivering a bayaan

Q: I listen to Islamic lectures, 6 points and talks all the time and I always forget what they say almost instantly but afterwards if someone talks about a section from it I am able to easily recall it most of the time. But sometimes when I am in Jamat/Tableegh/Path of Allah, and I become appointed to give a bayaan/ talk on 6 points or something I can barely recall or access anything in my memory even though I have so much knowledge about it somewhere in my memory. What should I do?

Sunnah method of using a miswaak

Q: I would like to know the masnoon way of doing miswaak. Should it be right to left in one go which would be the "length" of the mouth and the "breadth" of the teeth or is it to be done in an up down motion on each tooth starting with the tooth on top on the right which would then be the "length" of the teeth and the "breadth" of the mouth?