trying to convert grades from YDS to F

Hey, since I've usually only climbed in Norway and Italy, I have not had any problems converting grades. In most guidebooks the grades are written with both Norwegian and French grades, so I logged my ascents at 8a in French grades. However now I'm in Canada and have some problems when I want to log my ascents. The conversion table at 8a.nu starts at 5.10a : ...could you extend it also to the lower grades? Not everyone climb 8a. If I try to use the chart on Wikipedia instead, in combination with a chart I found on adrenaline.no but which was very similar, then it does not follow the 8a chart at all. Try for example to convert the grades 5.8, 5.9 and 5.10a into french grades and see what you end up with. In addition, apparently the Canadian climbers in this region do not follow any of these charts - some of them log 5.10a as 5b. So I don't really have a clue any more. I know grade conversion is not easy, and that I should not care at all since I only compete with myself. But since I'm trying to log my ascents at 8a I will have to convert the grades in some way - and it would be nice to have only one conversion chart instead of trying to mix up these charts which don't correspond (at least not in the area around 5.7 to 5.11c). Cheers