Personally I think you are missing several key pieces.
1. Runewood - Stryker's assassination run is great, but any rough terrain will screw that over, Runewood fixes that by being able to give him Pathfinder.
2. Squire. The extra
CTRL range for his Feat, extra focus when required and the spell re-roll especially when casting Rebuke
3. Journeyman Warcaster - Arcane Shield. Couple that with Deflection from Stryker you could have your Stormblades sat at ARM20 which will protect them from most shooting.
If you want Trenchers to protect your Stormblades then just run a min unit.
eStryker does nothing to help a Full Unit with 3WA
Here is a great article in terms of using Stormblades
http://privateerpressforums.com/showthread.php?162707-Madjack%92s-Stormblade-Tactica&highlight=stormblade+infantry+tactica and the
UA is defo worth getting.