Suspension

Hey there guys,
I'm new at this so please bare with me. I have a '99 Civic Coupe EX. I was fortunate enough to buy some Enkei Shoguns 17". I absolutely love them. Going along with the new wheels I got 205/40ZR-17's Kumho's. And finally I got my car lowered about 1.5 inches with the Eibach Pro-Kit Springs. I also have OBX Racing front and rear strut bars in. Now with all that in mind, when I'm driving relatively fast around 90+ mph's, and when the road dips, my tires will every now and then hit the wheel well of my car. First of all, I'm wondering if that is normal and what options I have to counteract that. On the road with everyday driving, the tires will rarely hit. So I'm wondering if I should just ease up on the fast driving or if there's something that I can upgrade. I've been told that sway bars are the best bet but money is definitely the issue there. Please help me, anyone out there.