The sheets that came on my DS clone are 1/2" thick. I'm not a super experienced sailor aside from Sunfish as a kid so I'm still very much getting up to speed here. It feels to me like there is too much friction on the main sheet and jib sheet. In lighter winds, the friction on the main sheet will keep it in place even when it's not cleated. Similarly, when tacking I have to pull the jib sheet backwards through the block or it will just remain stuck.
Am I missing something?
Here's what the mainsheet looks like running through a block: