Appointments+ not handling padding times properly

I'm trying to setup Appointments+ for a chauffeur service.

I'm having a problem with padding times. The service needs to allow customers to set their pickup time and then have 2 hours padded on either side. The problem is that Appointments+ is treating them as 4 hours blocks, so the customer only gets 6 choices of times for each 24 hours.

I have the service set to be 10 minutes, with 120 minutes of padding before, and 110 minutes of padding afterwards.

If I remove the padding times, the customer is given the choice to choose any time during a 24 hours period, split into 10 minute blocks. This is what I want the customer to get, but I need the system to then add padding.

What can I do about this?