70 degree 15mm is my main EP used on DSOs but its only a GSO SV, not inthe class of your pentax and televue EPs. still i fing 15mm very comfortable. this is in a f6 8" newt. so while i cant vouch for huge performance EPs i can say that a 15mm wide angle EP is very useable and great for DSOs in my scope
hope it helps just a little.
what scope do you have?