Next step up speakers in totem acoustic line from the totem forest?

Stick with Forest...Winds will require a sea change in amplification!

There is a new Wind design out. I do not remember the details of the amplification requirements, but it is 4 ohm, 87 dB. Heard it once at a demo and really liked it.

Forest is better than Winds in almost all cases unless you’re moving to a larger room.
Wind won’t give as much per funds spent as Forest and so is Shaman.
Factually, there’s no up in Totem line from Forest. 
Did you consider adding a sub?

I am very impressed by the forests and there low end no need for a sub. I am just starting to notice the limitations with a two way compared to a three way, and would like a little more focused midrange. Also in some bass heavy music I notice that the midrange can't stay focused with the lowed bass. I did try out the new Totem Earths with my system. And I could tell that the Earths had no trouble producing the midrange detail that I wanted. Though the bass was not as defined as the forests. But had no trouble producing the low octaves and, also was better to keep up with more bass driven music like techno. Which it acceded in and was so low it filled the room but was so low to here. 

Also in some bass heavy music I notice that the midrange can't stay focused with the lowed bass.

I believe that you're rather dealing with poorly mastered bass. 
Adding subwoofer will give an ability for Forests to blast midrange and they can give you great midrange definition. My favorite sub is Vandersteen 2wQ  or couple of them.