Re: EF Eri profile
Berto Monard has provided observations on 2006 Mar. 11 (one of high states in the 2000s). The orbital profile was similar to the current one (two maxima per period). It was not always the case in the past. See e.g.:
https://ui.adsabs.harvard.edu/abs/1987A%26A...181L..15L/abstract