I am not prepared to repair your simulation fault - but I can provide a clue on the AGC. it is similar to the hybrid cascode (hycas) introduced by W7ZOI. see what info you can find online - the article or related into may be there. if not email me and I will dig for it.
also the Jackal developers will gladly answer your questions also.
if you did your own circuit - I would carefully check the front end matching on the input of the IF AGC amplifier. if it is similar to the hycas, it requires a trimmer capacitor to peak the response.
73 Curt wb8yyy