I don't find mine very crude to be honest, it goes smoother than standard with a Tunit On.
It went to 183bhp and 330lbs/ft torque (PD140) and i'm getting a extra 5/6 MPG!
Don't know if its a genuine Tunit your using or a different brand, I had my Tunit set up on the rollers with a laptop tune And i love it to bits. Had remaps on different vehicles in the past and i find the difference between the two negligable. Good thing is though i can take it off when i need to. I can also transfer it if a get another 140PD.
Just my 2p's worth.