1995 CR 125 Jetting Problems

I got my 1995 CR 125 out this spring and I just can't seem to get it running right, it only had 90 pounds of compression so I rebuilt the top end, cleaned the carb, replaced the plug, and it didn't make any diffrence, it ran the same as it did. I am fairly sure I need to rejet it but I am not sure if I need to go richer or leaner. It has good bottom end but no midrange and won't even rev out close to the top. Hesatates badly. I am guessing I need to go richer because it runs slightly better with the choke on. Another thing, my intake boot between the carb and reeds has a crack in it but it does not all the way through, would this cause an air leak?