This is only my opinion, but I think any strut top spacer without a matching sfd is too much. I have ome 1.75" lift springs, and I also had 1" top spacers installed for a year and a half. In that time I had to replace 5 cv boots, (including 2 Rockford thermoplastic ones) and my hubs are unlocked on the road most of the time. I also had to use 2 sets of cam bolts to make my camber acceptable, and was always leery of that.
Since removing the top spacers these issues are gone, and I think it's not surprising, the front end is only designed to move within the travel of the strut. By lengthening it you're pushing other parts farther than they were engineered to go.
I know people will disagree with me but that's my thoughts and experience.