Peak Voltage

You are routing a critical signal net (Victim, V) adjacent to a wide bus line (Aggressor, A) on M5 for 1000 µm. A 0-to-1 transition on A causes a 0.4V capacitive crosstalk glitch on V. To fix this, you double the spacing between A and V, which exactly halves the cross-coupling capacitance (Cc). You also insert a larger buffer on V, halving its driver resistance (Rd). Assuming first-order RC glitch dynamics, what is the new peak voltage of the glitch on net V?