I'm sorry, I got diverted, and didn't realize the thread was for NE TIPA. You may as well ignore my previous post...
That said, 70 IBU may very well be right for a NE TIPA!
If that's what the OP indeed achieved with his hop schedule (see below, for review) and his process.
IBU values are hard to measure on tasting alone, they're merely a guide, or comparison from one recipe with another.
It's the sensation of the entire beer where you'd notice when IBUs are fitting, or missing the goal, i.e., whether by lacking bitterness, or are over the top.
IOW, the IBUs may have to be off by 30-50% (or more) when you'd feel it being out of balance. But even if it's off whatever mental mark you'd expect, it could still be a very enjoyable, and more importantly, memorable beer. I've enjoyed quite a few of those memorable ones, where you say: Oh, yeah!