I had the same problems I think CHIRP is using a lot of the same programing between the 5W H3 and the 10W H8. What I found is low is 2.5W medium is 5W and high is probably 10W on an H8? Since there is not a "high" mode for the H3 medium is the 5W mode. I switched my high power stations to medium from high power in CHIRP and sure enough I now get 5W .
Programing channels I noticed that if I delete everything by selecting all the channels, right click and select delete, upload all empty channels, then paste the channels or reload my config file and program it again and it all worked out. It's like there is some phantom programing or a delete does not completely delete almost like a dos hidden file lol
J
