We run the TT40s with Church Walleye boards, the tension spring is on the last setting and it still lays the flags back a bit once we get up over 2.0 mph. I'm probably going to look around for some slightly stiffer springs to replace what we're currently using. Just don't want to go too far the other way or the flags won't work at all. The divers pull pretty hard, but they're still the best option I can find for trolling this end of the lake.