Not sure which limit screw is H vs L I'm using a Devinci silverstone s.1 that's having trouble getting up to the highest/largest gear on the front. 

I checked the tension and it didn't seem to make a difference. Read I should check limit screws next. Mine aren't labelled H and L but I thought I could figure it out from the chain's behavior but for some reason as I tighten and loosen each one I'm not totally convinced which is which. 

There's one that's higher but closer to the lower gear and one that's vice versa. 

https://www.dropbox.com/s/1s19rrlvpe9foqx/file%202015-07-29%2C%2017%2040%2037.jpeg?dl=0
Almost always the H limit screw is on the outside and the L limit screw is on the inside.