Take this for what's it worth but I have a 2014 KTM 350EXC-F that I bought a couple of months ago & it's anything but top heavy or needs to be muscled. I had a 2012 Husky TE310 which was a really nice bike so I have some time on both & the KTM feels lighter & more nimble. I've bought & owned a lot of dirt bikes thru out the years & imho the 350EXC-F is the best off road bike I've ever ridden so I think all your worries about the new Huskies are unfounded but hey what fits me may not necessarily fit the other guy but if I was you guys I'd grab a Husky 350 asap.
Two of my buddies who I ride with a lot have KTM 350's, another buddy has a 310. They are both very good bikes. To me the 310 feels lighter, turns better an has more bottom (surprisingly). The 350 does not feel top heavy or heavy at all to me, feels very refined, works great and is fast but you have to rev it good to get to the meat of the power. Oh, one (350) is a XC and one is a W (or whatever I always get confused), one has a linkage one does not. The one with the linkage is MUCH faster than the other one and handles better too. they are VERY different bikes which really surprised me. The KTMs have a much better transmission spread and more useful. All three are great bikes. The 310 seems like more fun in the tighter woods and I feel quicker on it. The 350's feel a lot more versatile and finished. Just my random thoughts on the matter having ridden all three a lot and sometimes back to back.