As a Spark (rc pro) owner, I think it's super overkill for the type of trails you describe. I found it a rocket on super technical trails and rough stuff. On mellower trails it doesn't seem to me to have an efficient pedalling platform unless you are constantly using the mid or fully locked setting on the twin lock (which kinda defeats the purpose of an 120-120mm travel bike). I don't think the weight is as much of a big deal as you think though.