I think the 6x$35s are *generally* of the #3 variety. They like being able to play more hands than the full tables, they don't mind getting into a long, intense 3-handed/HU battle, and they don't like turbo. IE - they aren't 8-tabling pro-bots (probots - I like that). So barring any specific reads, I would assume weakish-tightish.

As far as block bets, he's first to act. He's already checked the turn. Just check, see what falls and he does on the river, then decide.

OP, what did you do on the turn and what was the river card (assuming you saw it).

One other thing, I seem to get in a lot of trouble with TPTK where TP = 6-9 or so, in a 3-4 way pot. It just never seems to work out and I can't ever push everyone out. Could be something there.