I think members hesitate to say that your opinion angle is perfect or good because there are factors that other members don't know, like how soft are your springs or how much does your pinion rise under load. I put my pinion angle at 3 to 4 degrees below parallel. This gives the pinion 3 to 4 degrees to rise in order for it to be aligned with the trans/engine. The web site I posted for you also talks about how you determine if your pinion angle is good. After you get it all welded and done you drive down the road, accelerate, decelerate a few times and see where/if you get a vibration. If you notice something during the accel/decel test you simply stick an angle shim in there. This is exactly what I did. It's almost impossible to know how much your pinion will rise unless you attach a GoPro to the underside of your car and hit the road. Sounds like yours is close to where it should be but personally I shoot for 3-4 degrees below parallel. I used to worry about this problem but now I just get it as close as possible to 4 degrees below parallel and shim it if need be. I have a pair of 2 degree shims under my springs right now and I have no vibrations!!!