To lower or not to lower???

And if you lower the front, and install the offsets, and set the specs to what Blu recommends(and I concur), you will very definitely get into an odd camber curve,and bump-steer. This may take your alignment guy several hours to correct. If you don't correct it, the alignment will only be correct in the straight ahead course and only over a very small amount of vertical travel.
When I set up my car I was a well seasoned tech, in an alignment shop.I had unlimited use of the bay during off hours. I could tell you how many times I put the sensors on my wheels, but then I'd have to hang myself, cuz it was criminal.
Also, be advised that once the front end height is chosen and set up, mostly it becomes written in stone.If you later decide to change the height, you will be looking at another alignment session.
Unless you need to lower the car, as opposed to want to;Wheels n tires are easier, and may be cheaper too. If you currently have good parts and good camber curves, 1 inch should be okay; but I would then forgo the offsets.As soon as those go in and you start cranking in the caster, the fit hits the shan.
Your results may vary.