Definitely get advice from your consultant before switching insulin, which i think is a bit drastic before you've tried other options such as changing pen, injection site and ratios. Try a different injection, sometimes the batch comes out a bit funny and doesn't work as well.
Humalog is a mixed insulin from what i remember, so i don't think (Humalog users correct me if i'm wrong!) you will need to take a background basal. So definitely get advice before just switching it out as it will be a big change for your body, and not necessarily a good one.