ok so you see how on the photo the fender/quarterpanel meets with the center of the tires tread area? when the offset is way to positive the tire area moves outward vs factory inward. this will mean the moment the suspension travels due to roads or pot hole the wheel has a great chance of making contact with the fender and ripping it off. rubbing is gonna be a aboviouse issue but fender damage is a greater threat. get the proper rims because the adapter spacers are not gonna work
imagine your at the gym parallel squatting. factory in this case would be you keep your feet under you as natural. going positive offset is spreading your legs wider then your shoulders, NEGATIVE is you putting your feet together closer together then shoulders. when you go down if the offset is to wide the shoulders are inside the feet (wheels) and when the shoulder comes down( the fender) it rips off or damages it.