I never liked the 1/4". Cuts way too slow and makes a lot of saw dust.
No reason to port at all with 1/4" micro.I did the 1/4 Stihl bar/chain conversion some time ago. You are right. It does work a little better on smaller pruning cuts. It's a toss up between the Silky and the 2511 which one to use. I can't see porting a saw for 1/4" chain.