Since it seems timed with the work changes , I'd keep looking into that scenario..

Do you still take regular breaks at home? do walking or stretching?
Also slouching/hunching posture can cramp nerves & blood flow up in the neck/chest areas pinching them and causing problems down the arms/hands.... and if long term it can end up a chronic condition called Thoracic outlet syndrome.. (TOS)

Look up ergonomic desk set ups and compare yours to those suggestions..it can even be monitor /keyboard angles - any tightness/discomfort in your neck at all?

A few simple things to try - many times a day -
http://www.neurotalk.org/members/100-albums422.html

More info on TOS & various RSI symptoms-
Trigger point information {TrPs} for short
http://www.neurotalk.org/thoracic-ou...les-polls.html
http://www.neurotalk.org/forum24/

The splints for carpal tunnel are not really for use while you are working.
The splint are to align your wrist in the proper angles when at rest..