Wacom tablet usage in 2012 R2 RDS

Setting up a RDS server on 2012 R2 for a medical client.
Everything is going swimmingly except for the doctor who likes to use a wacom graphics tablet.
He uses it for writing script orders, signing labs, etc.
In any case, it is a vital part of his work, and he needs to use it.
when he uses it in his RDS session, it sometimes misses when he picks the stylus up from the tablet, and so he will have a solid line from the bottom of on letter to the top of the next - as an example.  When he writes at a normal pace, it gets bad enough that it is difficult to read - he prints, so even though he is a doctor, his normal handwriting is legible.
The closer to his normal speed he gets, the less of the words and letters are actually picked up.
It is a small practice, so I really don't want to buy citrix or another pricey RDS enhancer... is there a tweak that can be done to Server 2012 R2 that will speed up his stylus?
The RDS host is Server 2012 R2, the client is Win 7 Pro Sp1, both fully patched.  The network connection is a 1Gbps synchronous WAN link at a COLO for the server, and a 100/10 broadband link at the practice.