hmm... sometimes the manual copying is not enough. The program probably needs an assign... (take a look into S:User-Startup of your AmigaForever and compare it to AmiKit's user-startup).
Moreover, during the installation of various programs, some files are often copied into other location (eg. LIBS: FONTS: C: or ENVARC: etc. I mean into other than programs home-drawer location. Therefore if you manually copy ONLY this home-drawer to other system, the program won't work under the new system, you know.
Therefore I would recommend to use installer when installing programs to AmiKit. Just make a fresh new installation of your AmIRC2 and Image Engineer into AmiKit (the same way as you did a time ago into your AmigaForever).
Then you can manually copy the programs' configuration files from AmigaForever to AmiKit, together with the AmIRC keyfile... btw. or try WookieChat ;)