@Irvin: I understand, every kevlar is stiff, very stiff and there is not big difference between the gauges. I think durability is not problem with every gauge, too. But I'm looking for the best spin potential, ball bite and tension maintenance of kevlars.
@graycrait: I can discuss about stringing 16G kevlar with my stringer. I hope he won't have any problems. He is an old stringer with many experiences. He works with strings and racquets over 20 years.
Your offer is great, thank you so much. I'm going to mail you.
@Shroud: Do you feel all gauges maybe the same? It's interesting. I used to play with polys, I don't have problem with firm stringbed, but I'm looking for more power, tension maintenance and similar spin potential. It will be nice to try all the gauges.
And what do you think about pre-stretching (kevlar and MonoGut ZX)? So what tensions should I try first time, because I'll have only one try to compare. Thanks...