I can see you're serious about your track-work, so you need to invest in a proper race seat with head side restraints.
At the very least you need to be using a 5 point harness and probably a HANS device as well, so a proper track-capable seat is NOT going to do double-duty.
I'm with thekinn who removes his OEM seat and installs the race seat for track days.
The quickest of the Z34's in Melbourne (down-under) does exactly that - he pulls his OEM seat and installs a race seat for club-sprint days - it was originally fixed, but now that his eldest son is driving the car as well, he's had to make a slider for it.
Seating base position is still around an inch lower than OEM so that will help with CoG a bit as well.
If you do not yet have a harness bar, you probably need to consider it (PM me if you want some options).
It sounds like you;ve reached the point where you are going hard enough to warrant a proper seat that the belts hold you well into, rather than something you sit on and slide around.
A proper seat is worth lap time because your full attention is n the track and not bracing yourself.
Some good seat options come from Sparco, OMP, Recaro and there are no doubt other options. I;d stick with an FIA certified seat for HANS compatibility. It is not a cheap investment but it is like investing in a good helmet ... if you have a cheap head - buy cheap helmet. Once lap times start getting serious, the margin for error reduces and the more protection you invest in, the better as far as I am concerned.
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