You can use a beard trimmer, siscors, or hair clippers to keep it even, but that doesnt mean you have to take the length out of it. Jus do minimual trimming to get the longer hairs and even it up. I think you beard looks professional now, and I do not think wearing a mask should be an issue. A little "fluff" around the srings is OK, do not get concerned about it.

My Beard Journey:  http://jefffsbeardboard.yuku.com/topic/25137/Finally-I-have-a-Beard
Beard and Bald Thread:  http://jefffsbeardboard.yuku.com/topic/27831/Beard-bald-head-shaved-head-or-buzzcut
Patchy Beard Success Stories:  http://jefffsbeardboard.yuku.com/topic/33742/Patchy-Beard-success-stories-Before-and-After-photos#.ViujbH7nuM8
Taming the Wild Mustache:  http://jefffsbeardboard.yuku.com/topic/30822/Taming-the-Wild-Stache#.Vj_Mh7erTIU