There has been a further development with my Caribbean "ampla". It looked and behaved so differently from my current ampla that I sent pictures to Kit Knotts to get her opinion. She was suspicious as well and forwarded the pictures to Dr. John Wiersma of the USDA GRIN database and undoubtedly the foremost expert on Nymphaea in the country.
Long story short....he immediately and enthusiastically recognized it as not being N. ampla, but an entirely different species named N. pulchella, which I found to be exciting.<g>
Out of curiousity, I plan to revisit some of my ampla crosses, but substitute the pulchella and see what I get this time around.