By the way, anyone following this thread should know... using Rocksmith to learn a song or a lick can be good (for seeing all the notes on your screen and being able to slow it down) but also bad... because their 95/100 speed is MUCH slower than you think.
All this time, I figured I was playing at a decent speed when I practised at around 90% or 95%... turns out it was slower than 145bpm. The song is in 160bpm.
Today I practised with a metronome and that really helped me pick up some speed (although I swallowed a LOT of notes at speed and eventually gave up ?) Too little too late but I won't make the mistake twice.
So my advice to you is:
Use Rocksmith to learn the song but once you get to 85% or so, ADD in a metronome to your practice.
That way you can also push past the tempo (I went up to 175bpm) as it will make the normal tempo feel way easier.
But, most importantly, you can know your real tempo and slowly bring it up to the album version. It also makes you pay far more attention to the notes and timing. Again, I learned this all too late. (Not that I feel I had a chance at beating @V8 after hearing his clip on the WhatsApp group! The chap can play ?)
I'm just glad I had an awesome excuse to pick up my axe every day (most days twice a day) for 2 weeks!