I completely over looked that in the OP. I'd guess that has a lot to do with it, if the recipe called for pellets, you gotta adjust if you're using whole hops. I always add 15% more weight when replacing pellets with whole.
I also totally agree with you about figuring out what gets you the best aroma/flavor from your late or dry hops. It takes some playing around with late additions and dry hopping.
OP, I've noticed that with extract beers, I need to increase the hops a bit to get the same flavor/aroma that I'd get in that same beer brewed all grain. I can't explain why, but my extract beers always seem to have less hops character than my AG brews in general. Using late extract adds may help with that a bit, but I've never seen much, if any difference in hops utilization between late extract adds and adding all the extract at the beginning. I'd guess the combo of this being an extract beer and you using a good amount less hops in the boil is why this beer isn't as hoppy as you expected.
I accounted for t the fact that I was using leaf hops vs. Pellets. I calculated the AAU's accordingly