I'm not trying to sound patronising or rude in any way shape or form but it sounds like you could do with practicing your gear changes a bit to get used to the different ratios particularly when it comes to dropping down at the front and up at the back. You'll soon get into the swing of rattling up and down the gears whilst still keeping the same cadence and you'll start to anticipate the change and click it in just before you need to in no time. Practice on the flat though not up hill, your mechs wont thank you if you start trying to change gears while you're straining up a hill and it sounds bloody awful too.