HyperLend: one venue, two rate engines

On a two-slope curve, utilization is below the optimal point. Which parameters set the borrow rate?

• The base rate and slope 1, scaled by how far utilization is toward the optimal point
• The base rate, slope 1 and slope 2 added together
• Slope 2 alone

HyperLend's isolated pairs and core pools sit on the same venue. Can you use the core pools' two-slope formula for a pair?

• Yes, because the whole venue is an Aave fork
• No, because each pair uses the rate calculator set at its deployment, a time-weighted model
• Yes, but only for stablecoin pairs