According to the protocols graph for liquidation penalty, it becomes evident that the MAX_PENALTY can only be achieved for ltv up to 89%. For higher ltv the penalty sinks again towards zero at ltv = 100%. Therefore, the searcher liquidation incentives are getting lower for ltv >= 89%.  
As a consequence, it would be more ideal to set the ABSORPTION_THRESHOLD to 89% instead of the current 90%.
