What you are doing by rescueing these guys is great! Sometimes kitties take a long time to adjust. I brought in a stray and a feral(differant times) After a couple of months they accepted the stray.....now the feral took almost 6 months but they are getting used to her too. good luck.....things should work out in the long run.
p.s. sometimes the kitties play time can sound like fighting but in watching kittens a know it't how they rough house.
