Do it! I lowered mine two years ago on Apex Springs. There aren't many options for the Tourer, but I've been really happy with these springs. After fitting it was about £300 in total. The handling is much nicer with the lower ride height. I occasionally catch my mud flaps on speed bumps, but that's hardly the end of the world. I have a chunky custom exhaust too which occasionally slightly scrapes on speed bumps and multi-storey car park ramps, but it's very slight and nothing to worry about.
I thought we got tourers to "load" all sorts of ***** in the back, at least I did, so the lowering bit does not compute, if you want a low tourer get over to a bscc meet and see if they have one of those "civic" jobs going spare.
I don't need to be able to take heavy loads, just large, bulky loads (electric pianos, guitars and other musical equipment).
But when I moved a load of heavy stuff when moving house this summer, it had no problems with the boot and rear cabin fully loaded with heavy boxes of books and so on.
It's a 40mm drop on a car that sits extremely high on stock suspension. It's hardly like we're rolling arches and having the bumpers 10mm off the floor .