Q2) What is the ruling on touching Tafseer& books of Fiqh etc. without
Wudhu where the Arabic Qur’aan content is significantly less than the
other (Tafseer, Fiqh) content?
Q3) What is the ruling on touching books of Hadeeth & Fiqh without
(Also, read this answer. Click here.)
2) If the words of the Quran are more than that of the tafseer then it will not be permissible to touch the tafseer book without wudhu; otherwise it will be permissible as long as one does not touch the words of the Quran. (Ahsanul Fatawa vol. 2 pg. 27 H.M. Saeed)
3) One may touch books of Hadith and Fiqh without wudhu; however, it is mustahab (preferable) to do wudhu before touching such books. 
Mufti Faizal Riza