If you're using Google+ to improve client engagement, you might want to consider using Hangouts On Air to interact with your clients. Possibilities to use Hangouts include customer service, webinars, conferences, software trainings, etc. Many companies (e.g. Dell, Cadbury, etc) have started to use Hangouts and met with success due to its easy-to-use nature and ability to share other content while video conferencing.
Changing to another channel for your marketing or customer service efforts may not be easy at the start, but in the long term, using Hangouts can reduce cost and generate more engagement.
Here's a link that might help you get started on Hangouts: http://www.forbes.com/sites/quickerbettertech/2013/06/24/heres-help-to-get-your-business-started-with-google-hangouts-on-air/
Hope that helps!