I've never noticed chisel to be any more jumpy when limbing than semi chisel. If you're using full skip then that could be the reason.I use the RS chain exclusively on my larger felling and bucking saws, MS440, MS660...however I use RM chain on my limbing saws like my MS250's due to the lower kickback and initial bite. When I get a tree down and I'm usually cutting in awkward positions as I make my way down the tree, I don't want the saw jumping around at all. I find there isn't much difference in cutting speed, maybe +/- 1 second through a 25" log?? The RM chains (esp the low-kickback chains) are the best in a de-limbing a downed tree.
Chisel does cut faster in soft woods. But not so much diff in hard woods.I cut mostly big softwoods (pine, fir). A properly sharpened full-chisel (RS) chain cuts noticeably faster, for me, on my saws, in the wood I cut. "Properly sharpened" is the key. Semi-chisel is a big more forgiving when sharpening and if you are hitting the ground, but is certainly slower. On full-chisel, once that leading corner is dull, the chain won't cut well, period.