On the Spaths size, Ken it might be another case of you not keeping your plants very long. My Spaths are pretty big plants, and as they mature they seem to be getting bigger and bigger each year. Not as large as a Phaius or Cym but the yellowish ones in the picture above are at least 2ft. tall.
Couldn't wait to show Bl. Little Lulu just opening nicely today, and Neo. Lou Sneary 'Blue Bird' with a few open on two spikes, and (to my delight) another spike on the second lead coming! This plant has been beset with insect problems, and blasted at least three spikes, so I am really delighted it has finally managed to flower.