Tight and straightforward players who refuse to 4-bet bluff can be exploited by 3-betting a lot, and not 5-bet bluffing at all. You can 3-bet a ton of bluff hands, and when they finally pick up a hand good enough to 4-bet, you fold all your bluffs and ship a tight value range (sometimes as tight as {KK+}). Just keep an eye on the other players to see if they are trying to exploit your loose 3-betting (tighten up a bit if they do), and you’ll do very well in this spot.
