The big issue is making sure the profile matches the data you're using. My jet and my data can use anything from 400 to 1500 ft. The key is that they match. If your data provider uses a 400 ft. level off, then use 400 ft.

For what's it's worth, the MD-80 is authorized (with special training and FAA authorization) to use max thrust for up to 10 minutes. It's required when the level off altitude is lower, not higher. No matter what the level off, runway analysis ends at 1500 ft. AGL.