Do I build Proac Response 2.5 Clones?

Did a wee bit of simulation using WinISD to compare the Proac R2.5 Clone vs the M5. Results are a bit puzzling (to me at least).

Red = M5
Green = R2.5 with 38Hz tuning in 34L box (as per spec I believe)
Blue = Must messing with tuning on the R2.5 to see what happens if tuning dropped to 30Hz

Couple of observations:

1. The Proac looks very bass heavy
2. Proac with modified tunning looks pretty nice
3. M5 looks a bit bass light but this is not consistent with Goran's simulations. I think Goran uses LSPCad. Is LSPCad including other factors in its simulation?

Cheers

Modify the Proac tuning - exactly what I would do if I had them now. They are very bass heavy with poor pitch definition.

You can see my in room measurement in post 23 below.

Why do Proac 2.5 clones fail?