Originally Posted by fortun8son
Leoina 77 (1.30) is thinner and may work on the denser pattern.
OGSM17 works well on those 18M frames.
I use it mostly as a cross because it doesn't hold up that well fullbed in the more open patterns.
Thanks to you all for your recommendations.
I will certainly put on my list some of the strings you suggested, including the Leoina 77.
OGSM17 still did not perform as well on other 18x20 racquets I used in the past (basically rapid loss of tension and control), but I will give it another try in a hybrid.