What's the deal with 850 rear camber wheel adjustment?

Anyone make shims?

Make one's own?

Live with it? (Right rear is at -1.6 degrees, slightly out of spec; now there is a bit of cross-camber in the rear; the car tends to follow the crown of the road a bit more than it should, especially under hard acceleration or other rearward weight shift).

Should I just do a little trigonometry and figure out how thick a shim (washer) to make? If so, is it necessary/recommended to fill the space/gap created to keep water (expanding ice) out? If so, with what?

TIA

- Dave; '95 854T, 145K mi


PS: I'm still loving my new Goodyear Eagle F1 GS-D3s; they are, quite literally, sensational summer performance tires. Unless you frequently find yourself driving on gravel (where their performance is nothing special, and they tend to pick up and retain ~ 1/2" gravel... but it's harmless fun getting the tires to release them once back on pavement...!), I recommend them highly.