Nobody likes to admit they're wrong, but I misread the manual, which says that the coil does NOT need to be fully installed for it to function, which contradicts what I told you previously. I looked at the electrical schematics and also see that the coil has no reference to ground, so the foam tape you put on would not cause a problem, and would help minimize vibration as Lefox advised.
Anyways, back to your problem- I don't know what kind of volt/ohm meter you're using, but if you have it set on the wrong scale when doing resistance checks, you can get erroneous readings, especially when you're measuring down in single-digits (like your primary check). Measure your primary resistance again and make sure your meter is set on the "x1" scale or whatever the lowest scale is on your meter. See if that reads closer to the .5 to .7 ohms you're looking for. Make sure you're measuring across the two outer conductors on the coil connector plug. When you check the secondary resistance across the two coil outputs, set your meter to the "x1K" scale and see if that's the problem. Your posted resistance readings may not be correct, but they don't indicate a short or open either, which is what usually happens when a coil goes bad. The fact that you're getting the same erroneous readings on two different coils also makes me suspect the meter settings used on your checks.