Again, it is not a good idea to lengthen stride, but use a lighter touch and quicker turnover. You can go faster that way. You might increase your forward lean slightly that will increase your speed.
If you run the same stride going up hill, you have to work harder. Studies have shown that as runners get faster, their stride length shortens. So quicker turnover is the key here. Paradoxically, a longer stride takes more energy, so you'll get into oxygen debt early.