start lifting heavier weight... if you can bench 205 cleanly do sets closer to that.
A simple way is keep doing 5x5 but work up to a max set of 5 over the 5 sets.
So the first week may look like
the first week the final set should be hard but not impossible. Next week add 5lbs to each set. if you actually have a current estimate of your 5 rep max just aim to hit that on the 3rd or 4th week and then keep on going. If you don't hit 5 reps on the last set keep the weight the same the following week.
make sure you hitting shoulders/triceps/back heavy with compound movements as well.
Can also check out west side for skinny bastards or one of waterburys programs for a different more detailed plan that will also help you get stronger