That head is really holding you back. You have a solid bottom end but Defiantly go for the +3 but a better cam and a mild port and polish and having it ported to the TB makes all the difference.
I agree with this, cam and porting need attention. I have 11.1, +5 stroke, Cuervo +1 head, HDD5050, and +2TB, that equals 66HP. I have a strong power band thru the RPM range.
I bought the TB used, if I was to order new, I'd get the +3. But, as said, you still need a better cam and head.
As said above, you CAN NOT skimp on the head. You have this massive motor and it NEEDS a massive amount of air. With the stock tb and stock head your suffocating that thing. With that size cubic inch I'd go with the biggest valves and port job you can. It won't be cheap but that is your limiting factor right now.
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