1st thought is of course that you got used to it being too low give it another 30 years and it will sit low again

I replaced mine with 1991 w126 seats and it was much higher, I just motored it back down to where I like it.

It's completely normal. If its too high at the lowest setting, you can try and pull the seat and bend the lower frame with the right c-clamp but I'd say that's a last ditch effort.

At the lowest setting is it too high?

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg