Live power display – turns red at too low an upper bound

When I am training in slope mode with specific wattage targets for different intervals, I use the live power reading to help hit my target. However, I really find that the upper bound for this number turning from white (in target zone) to red (above target zone) occurs at much too small an increment above the target wattage. For more intense efforts, it seems to be just 3 or 4 Watts above the target wattage. Given the inherent fluctuations in the live number, this means the display is turning red very often, just so I can hit the correct average wattage for the interval. Is there a way I can change the upper bound to a higher value?