When you are running think about running Quick and Light on your feet. Make this one of your mantras!
Increasing the number of times your feet strike the ground per minute will help you find a form that’s more upright with less heel striking and overall more efficient.
As a tip, and something I’ve practised with my groups, count the number of times one foot strikes the ground in 60 seconds. Double that and you have your strikes per minute. You should be aiming for 180 strikes per minute eg a count of 90.
Start by practising on a slightly downhill tarmac section and then see if you can maintain the cadence uphill!
Another advantage of practising this approach is that the very act of counting can distract you from the run. I read that Paula Radcliffe counts to 100 when she is going through a tough patch. This can have a similar effect.
Try it! It can really help to reset your form and pace.