Deduct a proper Amplification parameter based on target slippage?

Hello, I am trying to create a pool for synthetic assets eg, A and xA (a synthetic of A). Due to a specific redemption mechanism of xA, I am trying to set it up so that there would be a price slippage of 0.5% (so 1 A > 1.005 xA) when the pool’s imbalance is at 30/70 (30% A and 70% xA). Does anyone know how to deduct a proper amplification value or any tool that I can refer to?

Any help is much appreciated. Thank you!