Generally, Gauntlet prefers keeping rates across markets consistent. However, given that borrowing is frozen on v2, we are not strictly against having different IR parameters across markets.
However, Gauntlet would support maintaining Uopt = 45% and increasing Slope1 = 14 and Slope2 = 300 for ETH v2 and Polygon v2 markets. This would support migration and mitigate risk to the v2 markets. By maintaining the Uopt = 45% but increasing the Slope1 to 14% and Base to 3% to match, the proposal may incentivize larger borrowers to repay. If not, then the revenue to Aave from CRV borrowing increases 2.5x.