Try to take a break.. i had plateaud at 163 (5 PTs over 2 weeks: 163-163-163-162-163).. Then my next 2 were 161 then 159. Took 2 days off then got a 168 (had never score higher than 163).. Did another 1 the next day, got another 168.. Dont think I'll ever look back to the low 160s