Musikraft do only carry the standard truss rod, in both single acting and dual acting (no particular difference in weight or sound between the two). They don't carry a double thingy like Warmoth does. That's the one which causes real weight (and tone) issues, for me.
Musikraft's necks do tend to be heavier just by virtue of them generally making their necks thicker. If you look at all the profiles that Warmoth, Musikraft and USACG offer, Warmoth tend to go slightly flatter and thinner than the neck they copy/compare to, Musikraft tend to go for rounder and thicker and USACG go for direct copies of existing necks. So the 'medium C' that Musikraft offers, for instance, is considerably more wood than a Warmoth Standard. Obviously, more wood = more weight.
The Klusons that they will install for you are also a touch heavier than most cheap Kluson copies that you may be used to.
There's also the simple fact that some pieces of wood are going to weigh more or less than others. It may just be that you got a particularly dense piece of maple. For what it's worth, I got a one-piece, 1"-thick rosewood neck from them with an oversized Jazzmaster headstock and the Warmoth Thinline body that I put it on balances perfectly; if anything, the body manages to be heavier, still. Luck of the draw is a big element of it. I believe this is one of the main bonuses of the 'baked maple' option that Musikraft have begun offering, as it makes maple lighter without reducing stability.
Also, Musikraft are very quick at responding to any questions and this is a Warmoth forum. Should really just shoot Musikraft an e-mail with questions about their products, you'll get a quicker and more useful response!