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My Z2 is also about learning to ride fast.
I need this as all my intervals are uphill. So I cruise flats, and attack climbs.
Stresses me out when folk start gunning it in a race.
So I ride at say 200w for a couple hours, while also aiming to move fast. Tend to judge the ride on av speed as much as av power.
Depressingly i can can achieve my high z2 on the wheel of my mate also doing his Z2. His Ftp is like 85w more than mine. But this adds to race training. Our last session was over 4 hours long.
I could barely walk the next day.
I tend to do SS after consecutive days (so tired) and before a day of z2 or rest.
I suppose it depends how much you do: hours or sessions on the turbo of 4x8m (which seems really soft but apparently is all good).