Tatyana said:Muscle soreness has nothing to do with muscle growth.
Also, doing 2.5 h of ab work is over-training, which is just as detrimental to putting on muscle as not training at all.
Some PTs are great, some are rubbish.
^All very true^
If you can get a good PT it may well be worth it in your instance but they are hard to find. What your doing now seems to be a detriment to where you want to go so clearly some help is needed. There are plentiful resources on this website for you to read on and research.