Shaky engine

I fitted the sdi on my 45 L series, an upped the boost to 19psi, blanked the egr fitted a cold air intake and a decat.

When the car runs in fift gear at low rpm (1500 til 2500) it shakes like a mad man aspecially under havvy load (when towing a trailer).

Is this a normal thing when running the sdi's? Or is there somthing seriously wrong?

It runs fine in first, second and thirt. forth its a bit shaky as wel, but not as bad as fift.

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