If you formally introduce your AT Pro to the Mohave, it may through compliment the AT Pro's way
I see you have a Sand Shark, which detector is easier for you to ID the target by sound? Do you like the nuances of a single tone better than multiple tones and a target ID number on the display? If you mainly hunt around water, the Mohave is not waterproof, and may not be a good fit for you. If the AT Pro fits most of your hunting style more, and you hunt parks, schools, and private permissions inland with the AT Pro, I'd look to another coil or coils in lieu of a new detector. I own multiple coils for my primary detector. A big 15" x 12" SEF coil for low target dense areas like fields. The bigger coil allows you to cover more ground per sweep, will give you a little more depth, (note: your target ID accuracy decreases after a certain depth). I have the stock DD which is what I normally run when I start hunting a site. If the site is trashy I will install the 5"DD. Due to it's smaller size it has great target separation. There are some permission I have pounded before using both the stock and 15" coils and yet the 5" coil sniffed out some keepers.
I have read nothing but good things about the Mohave,

it's just not my cup of tea.