I had a similar issue when i started dumbbell presses. I found my form was horrible when i first started because my muscles were not use to stabilizing the dumbbells. This resulted in my chest not feeling like it was getting hit properly and my technique being all over the place. I dropped the weight and after a very short while nailing my form and allowing my stabilizing muscles to catch up, i could increase the weight steadily.
As far as chest and triceps exercises that require minimal equipment, chest and triceps dips always wear me out
I don't know why I didn't think about lowering the weight... Seems so obvious xD
I'll give a few sets of dips a go tonight, see if that fires things up. Thanks
