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Am I likely to cause problems?..it just might reduce their lifespan slightly.-30mm and a comfortable ride, Apex springs are the way to go. Very nice price too 
They tend to rust never to be removed again without knackering them. Also you need a grinder to cut a section out of the bracket that holds the brake pipe, to save you having to bleed the brakes afterwards, and spring compressors will be needed to get the rear shocks out without taking off the drive shaft. Heat up the drop link bolts before you try to remove, as they wont like coming off, use a good quality allen key set. !!! 
(careful of the brake and ABS wires/pipes, then the nuts come off ok. 
!!! Just knock it out with a screwdriver and light hammer. Then no need to break into the brake system. I've no long term experience of my springs but it hasn't seemed bad at all in the few short hops under tow 
I have PI springs which are progressively wound and give the car a great stance, also doesn't make the car ride like a roller skate, even with 18's on it. I have photo's but I have the slowest intenet connection in the worl while offshore.-30/40 mm drop,nope looks standard to me so I will be changing to Apex when I have the cash .8 bar Pipe needs to the unbolted, unles someone has already cut the bracket up.!!! "broke" or not "fit for the purpose" when they removed them when you get the final bill.!!! I find them very harsh though on rough roads. I requested the spring rates from Apex and they are:(286 lb/in)(239 lb/in) If your still on original springs they'll have sagged a bit over the years and of course the 2 got lower as standard over the yrs as stock. After market manufacturers could be quoting from a rev1 ride height. I think but am not sure rev2s may have been lower but it may be from rev 3 on? £20-25 per droplink from good affiliates, but over £100 each for standard part!!, £40ish per top mount (do in pairs & consider TRD, cheaper I believe than standard part) Where are you fella, plenty of good affiliates who could do the job and if you're reasonably close it's probably worth a wee drive.