That first table seems wrong - on the 1-10 RPE scale I’ve always assumed that around 3/4 is LT1, top end of endurance, and 8 is LT2 or threshold. RPE6 would be Tempo/ bottom end of sweet spot.
If you’ve a HRM then Pettit should be Z1 all the way or just pushing into Z2 if outside and the terrain catches you out. On the turbo I get a max HR about 10bpm below the Z1/2 boundary.