One of the issues with xenomorphs is that as soon as a chestburster kills the player, all equipment they had is lost due to the gibbing process. This makes it even harder to fight xenos as there's generally no equipment left over to fight with. What I would recommend is implementing the Colonial Marines Server style of chestbursting. It kills the player, but leaves the dead body. Being able to reclaim items would be a large boon to playing against xenos. Depending on the round type, it would even aid antags, so they could reclaim things like the CE's boots, the Captain's laser and the like.