don't fish Sylvan but do love fishing whites
I use fluorocarbon from 2# to 20# for Lake Whitefish
I fish several lake's around here and one Jasper Park
I use a Fly Rod with about a 10 to 14 ft leader/tippet
also like using a Blood Worm imitation fly
like too fish about a foot off bottom using a indicator
or will strip in line keeping it near bottom to rising if being chased
Lake Whitefish when they are hunting for food I find like a bit of movement
if in clear water u can see when they see and attack your fly/hook
if u have a windy day I will just let my fly bob in waves under indicator
as all ways this is
Food for thought
David