Ride Height

I have fitted new Road springs to my 1989 110 commercial. The drivers side is 35mm higher than the passenger side. I know that the springs are different and that the drivers side is supposed to be higher, but is 35mm excessive? When I sit in it the suspension drops by around 15mm. Perhaps the springs will settle with use.

I think mine (Terrafirma +50mm) were around 30mm difference on the ground and a similar difference to yours when I was sat in it with a full tank of fuel.
I've not measured since last year (when I fitted them) but everything see 'normal' now.