A security control deck is not complete without recovery, and we can play [BT1-107] Holy Wave and [BT4-105] Tactical Retreat!! for that recovery consistency.
These option cards generate tonnes of value when they are triggered from security, but may be slightly more cumbersome when played from hand.
Holy Wave is a 6-cost option card when played normally, which is very expensive. However, being played in security control format and the Dexmon/Sakuyamon bargaining chips in hand, giving your opponent more memory to build their board won't necessarily be a bad idea as long as what their board setup timing is still under your control.
As for Tactical Retreat!!, this can be a great card to send your Meicoomon back to your security. Great value comes from sending a suspended Meicoomon (after attacking security and surviving) back to your security so that it can just pop back out when your opponent's Digimon swings at it again, potentially triggering your Meiko tamers for additional memory gains.