I wouldnt grind down the spine. Do the math and measure your blade. It might he off a little but you can shave with a higher angled bevel. There is a limit to where it gets noticeable but IMO it takes a bit more than what you did. Those spikes are normally a small angle to start with.

Id lean more to a bevel issue or you didnt remove enough stria from the bevel in you progression. Moved up the stones to quick. JMO.

The more experianced folks will jump in soon. Honing a razor is a different animal than sharpening knives! Takes time to learn.

BTW, Welcome to SRP!