if you get a long-term system with a lot of plays i would say anything above 115% is worth playing as long as you do it consistently. if it's a 35-50 game system i want to see 125%+
in hockey you also have to check out OT stuff. so on a query just add "overtime=1" to see how many of those results were done in OT.
example...tonight with Sens in the 26-4 SU subset 7 of those 30 went to OT and 6 were won by home team so i decided to take the ML over the regulation .... opposite that in the pp:FW like Pens are in the OT results would not have helped ROI at all so played -102 regulation instead of -170 ML
i also have groups of teams to watch for OT. example i wouldn't play a team like TB the other night vs Devils and include regulation because the Devils go into OT so much and are so good at collecting points there. much wiser to play TB regulation (i lost either way) at "+ odds" than dropping -115 when the result is not likely to go your way in OT
similarly took Boston in OT last night because...1) system they were in teams did really well in OT, 2) neither bos nor det are heavy OT teams, 3) boston one of best OT teams, detroit one of the worst
my quick cheat sheet is:
most OT = Chi (by far), NJD, LAK, PHX, WAS, SJ
least OT = Dal, Car, Phi, Edm, Cbus, Pit, Nashv
best OT win % = Avs, SJ, Pit, Bos, Winn, TB, Cbus
worst OT win % = Car, Fla, Nash, Phx, Edm, Anh, Det