Noice drop, I would have waited for the H&R springs BUT did not want spend the extra $$ on control arms. Had this set up on both of the Z33's but had to shell out the $$ for control arms to get camber back in spec. The same will apply for the Z34. Tires will wear out with the negeative camber. Rule of thumb is (was) anything over .75" drop will need camber. Eibachs with a .09 drop fr & rr I was able to get the negative dialed, not back to spec but within a sweet spot for better handeling and now with over 5k miles I see no wear at all.
Taking the drop to 1.3 like with the H&R will make the negative camber a bit more and I feel the control arms will be needed to bring back in spec. Now if the alignment can keep it an acceptable range and most important is no excessive wear, then I would have been all over the H&R's. Do not get wrong I loved my H&R's on the Z33 (a little harshed thou, but still awesome) and would have waited for them to come out for the Z34, but pulled the trigger on Eibachs and that is where they will stay until enough $$ for KW coilovers.
Cutting the rear rubber spring mount WILL lower the car in the rear. It was proven effective on the Z33 as I did it to both Z33's. The only draw back is the rear struts may wear out sooner.
Spacers: 20 mm fr and 25 mm rr look the best. If you want the flush look go with 20/20. With 25 mm rr the car looks like something is happening out back, a mean agressive look as opposed to the flush 20 mm (you mean you widened the rear? It still looks stock...haha)
Be interested to see alignment data sheets from the OP. Overall very noice stance.
