That procedure sounds correct if you are using the "two-schedule" method outlined but I do not believe you are going to be able to change the recovery period ("depreciation time") manually without doing some sort of override.
You can try various combinations and permutations in Forms Mode as a test, but you will most likely have to override one or more figures (or options). TurboTax just does not really support 1031 exchanges very well and multi-asset exchanges are especially problematic.
