35 or 350wt is the same thing, some companys list it differently.
the 10,000 silicone they offered you would be OK in the centre if you wanted plenty of drive but it would push on a bit in corners!
you'd be best with 3 or 5,000 in the front, probably about 7,000 in the centre & 1,000 in the rear
thats good in my Kyosho & Mugen, or thereabouts anyway