xerotherm arctic

[ScubaAl]

I have not used either of these undergarments. I have a new DUI CLX450 and pickup a fleece undergarment thats just too bulky. As such traps too much air in the suit. I dove this past weekend at Wazee, with this fleece and polyprop I was way, way too buoyant. I'm now wearing 8lbs more then before, and could us at least 4 more. This is diving steel doubles.
So I did a search on TDS or  The ScubaBoard can't remember which. Lots of comment on the xerotherm undergarments, most liked them.
What I'm in search of is some combination of undergarments that will keep me warm in 39-40 degree water without adding excessive buoyancy. 
The xerotherm isn't cheap, but if it does the job, then it would be worth the cash.
                                                        Al