Chuck:

I fish small to minuscule streams all the time. I also fish furled leaders or braided butt leaders all the time. 98% of ALL of my dry fly casts are directly upstream; over the fish.

I have no problems what so ever with ANY leader because the fish never see my leader; just my tippet & fly. Accuracy is the most important thing. Yesterday I was fishing a couple of super clear wild trout streams with a 32" furled leader with two feet of 6X tippet.

The fish couldn't care less!