Well, since you have the SVT and it's already about 1/2" lower than the regular ZX3 due to the SVT springs you should be able to yield the height your looking for by going with a spring that advertises a 1 1/2" drop. This would give you the additional 1" you’re looking for. Or you could go with a set of 1.8" progress springs which will give you a total of about 1 3/4" - 2" drop overall, which would give your current setup about a 1 1/4" - 1 1/2" drop. all of these results are estimates since they don't always drop to exactly the advertised height. We installed progress springs on both of our Foci and they both dropped exactly 2".