As Jon mentions, there is a built in lowering system that takes effect over the years. Height will also depend on wheel and tyre size, a lot of the u.s folk run tall tyres which makes the car look lower in regards to the top of the tyre sitting inside the arch, when actually the height is normal /slightly higher than normal. Stick some 14's with a 205 / 60 tyre and the same will look like it sits too high. Yours looks pretty spot on, what size wheel and tyre is on there? Spring assistors are ok if it's a small adjustment, 1/4 to 1/2 an inch or so, but much more will transfer too much stress onto the bolts and also affect things like roll centre. If the springs are saggy, borrow some time on a hydraulic press and rearch them ( or use a vice at home - this takes longer but you get Arnie size arms as a result).
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