Now I see why I was confused. When you describe a tunning, you usually start with the 1st string (Not the top one, but the bottom as you hold the insturment). That is why the tuning did not make any sense. So you are as follows:
____________
X---D
X---A
X---E
X---B (Added a Thicker string from 5 string set)
If that is correct, then the tension on the neck will be increased as you have reaised the pitch of each of the lower strings a bit and added a heavy B string. Sounds like you will need to get it set up with a little tighther truss rod adjustment. The intonation on the new B string will be silly if you have changed to the point at the nut where the string clears it. This could possibly change the distance to the bridge thus affecting your intonation slightly. Most likely not though.
Fangar