First I would like to make an apology if I'm the one who causing this problem.
Nope, you didn't cause any problem and I believe an apology is totally unnecessary. And I did not mean to start a 4 page thread. Was just curious.
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By the way, to your original question, as I was learning to fly I had a number of experienced enthusiast tell me the perfect line length to use to trick. Everything from 25' to 125'. The most specific being 63'. Not knowing any better I tried a number of these only to find the lengths (yes plural) that I considered ideal. I appreciated all of the strong opinions and used them to find my own way.
25' is great fun for a small kite in light wind-really up close and personal.
63' is such a precise number that I have several line sets this length
75' - 85' doesn't suck either
try several and find your own way. keep flying, posting, reading and of course buying new kites...
Thanks Steve for letting us all ramble!