This is silly. You will absolutely have +44 crit and +31 det if you melded those.

Look at the meld% for det vs. other materia:

Crit melds progress at 100%, 100%, 100%, 100%, 100%, 100%, 96%, 90%, 82%, 72%, 60% for each tier (overall 91%).
Det melds progress at 100%, 94,%, 88%, 80%, 70%, 60%, 50% for each tier (overall 77%).

It's WAY more difficult to successfuly meld determination. THAT's the cost of maxing determination over "cheaper" attributes!