Help with heads-up in SNGs

[Dragonith]

I multitable SNGs from $20-$50 4 at a time. I find myself losing a disproportionate amount of heads-up matches even when I start out about even with my opponent or as the chipleader, I believe it is because I am not able to focus on the headsup match so I lose alot of my smaller edges. Is there anyway to compensate for this thru deviating from optimal heads up strategy? Or if you have any advice in general on headsup in SNGs it would be very welcome. Thanks.