OP, given your case with really wanting to use your 19" wheels (for some reason), your best bet with the available 19" hoosier A & R tire sizes is to go with 295 all the way around... You should be fine with that and be able to fine tune the rest of the car from there.... Let me know if you have any more questions or need any help... (however it would be much better to use your 18" wheels you mentioned)
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