You took over #300 off the front end. Added #980 to the rear axle with the WD attached, so I'd think you need to move a bit more off the rear axle to the front and you can only do that by adding more tension to the WD bars.
Not sure what WD system you have, but if you are talking about moving brackets, I'd have to guess you have the Equal-I-Zer hitch setup.
You might be able to tilt the hitch head back by a few degrees. That will put more tension on the bars without having to move the brackets.
With a WD setup, you also move some of the weight to the trailer axles, so that's why it's hard to say what your actual "tongue weight" is..
It's heavier than #640, but without knowing how much it took off the front end and added to the rear end without the WD bars attached, it's only a guess..
It really only takes basic hand tools for the brackets, but might require larger size sockets for the hitch head adjustment..
Depending on your DIY skills and tool box collection will determine if you can/want to do this fine addjustment yourself.
Good luck!
Mitch