Jason
The first thing I would say is to stop thinking about your DLA, PIP has very different criteria, where DLA refers to a need for care, PIP has specific criteria, where DLA referred to bodily functions PIP considers your ability to complete 12 specific activities.
Have you looked at our PIP Claim guide?
www.benefitsandwork.co.uk/help-for-claimants/pip Mobility is one of the areas where the two benefits are quite close but there are still differences in the criteria, so you could meet the DLA criteria by being virtually unable to walk, PIP looks at the actual distance you can walk and the test is stricter for the higher award, under DLA it was accepted as being 50m for PIP it is 20m.
Gordon