Gave up the Swift FX after many months of tweaking the straps from real tight to nearly fall-off loose. Changed pillow sizes too. Got bad leaks and very dry eyes. Also rolled onto the hose and pulled whole thing off my head.
Opus 360 nasal pillows work great for this side sleeper. There's more side-to-side support to keep the pillows seated. Since using the Opus not once have the pillows popped out of place.
What Opus 360 looks like: http://www.cpap.com/productpage/fisher- ... -Mask.html
Could your hose pull the pillows away from your nose? Have you looked into any kind of management system so your hose moves freely when you do? Nice thing about the Opus 360: the hose is secured in the top strap of the headgear. The hose just lays on my bed pillow and (with no bed headboard) it drops between the bed and wall to machine.
Bed pillows play an important role in reducing leaks too. A firmer one worked better than a soft one. Some here use natural bed pillows with plant hulls in them.Hopefully someone will tell you what they are.
Good Luck and Sweet Dreams,