Proper Shroud Tension

[dijon]

Hello: I am new to the forum and recently purchased a 2006 Hunter 25 trailerable sailboat. I wrote Hunter Marine and sent an e-mail in regards to proper shroud tension. No answer yet. I have upper shrouds which are discontinuous (attached to an aft angled spreader) and then a second shroud (is it still termed an upper or now lower shroud?) continues to the deck. There is no way of directly tensioning the upper shrouds. I have read that on a Hunter 26 that the upper/lower tensions should be 20/10 % of max. breaking strength. Any recommendations at what I should set my Loos gauge at would be appreciated.
Thanks in advance, Dijon