Yea now that i know your experience levels an stats i would definatly have you training 3 days instead of 4. Like SWAD1987 said you need to get stronger, especially with your current lifting stats.
I would use the 'starting strength' routine for you to begin with. Its a routine that has helped many beginners get their strength up dramatically and to quote SWAD1987 again the more strength you have the easier it will be to pack on muscle, not to mention this routine WILL add muscle to your structure especially if you make sure your diet is in check (e.g. eating LOTS and lots of healthy food). Rather then suggest you buy the book (though buying the book is a great investment) here is a routine that is very similar to what starting strength is:
Bench Press 3x5
Barbell row 3x5
(optional 2xFail dips depending on how worn out you are)
Military Press 3x5
Deadlift 1x5 (build up to one heavy set of 5)
(optional 2xFail chin ups depending on how worn out you are)
Each workout add 2.5kgs to Bench Press, Barbell row and if you can military press (you should be able to for military press, but if you stall with a weight just stick with it until you get 3 sets of 5)
Each workout add 5kgs to your squat and deadlift. If you find that adding 5kgs each workout to squat is a bit tough just add 2.5kgs. If you stall at all give if a few workouts an if your still stalled then drop the weight by about 10% on that lift an work up again. 1 step back an then 2 steps forward kind of thing.
Dont worry as your strength gets better and your eating lots, you will certainly notice a lot of size gains too.
Any other questions feel free to ask.
Btw which state of Australia are you from? I live in south australia, not too many australians on this site at least i havn't seen many