my other wheels are 9.5 +46 and I also run 295s on those, they are as tucked in as they can get, as I need a 5mm spacer to clear the front control arm. Never had problems with 285s on those wheels.
The equivalent in a 10" wheel would be a +40 offset. The 30 you are considering will push the wheels even farther out than the 35 and that probably won't work.
Also, in the rear, unless you want to change out the wheel studs and never be able to use the stock wheels again, I recommend the bolt on style 25mm spacer. The 20mm bolt on spacer is shorter than the existing wheel studs and some wheels won't fit flush with them installed, stock ones especially.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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