I feel your pain with the Eldar situation
lol. When fighting Eldar and Dark Eldar, it took me forever to get the right tactics down. those squishies are really hard to get into
CC lol. Basically, they only have armor 12, but are fast. So I use lots of med
str weapons like lootas (cause I'm ork) but I'm sure you nids have some sort of med
str fire you can loose downrange. Heck I've seen sealers take out a land raider in
CC cause of the rending so maybe that's the way to go. Once you take out the Eldar's legs, they are REALLY easy to mop up