So this is a stress/Ion list I want to try:

Serissu (M3a Scyk) 20pts

Heavy Scyk 2pts

Flechette Cannon 2pts

Shield Upgrade 4pts

Elusiveness 2pts

30 pts

3x Syndicate Thug 54 pts

3x Ion Cannon 15pts

3x BTL-A4 title 0pts

69pts

I'm wondering what people think, particularly about whether Shield upgrade is the right call vs. Stealth Device? Serissu will be slow played to stick with the Y wings, so should be able to use green manoeuvres often enough to get elusiveness just about every turn. Thoughts?

I think the extra point cost for the shield is worth it.

Stealth Device is a good idea 4 defence dice for a while ...... fly in a diamond formation with the y in front to protect him and give them the re roll

If you have the SD and take a hit (and you will) you lose it and a shield, effectively losing 7 points in one hit. Take the shield upgrade. I think in the long run you come out a head.