There are some shallows in the Western approaches. All are very well charted.
I can recommend the Admiralty small craft chart pack for the area it has all the necessary info thereon.
There are also numerous lobster pots, some buoyed fairly well and some (a lot) not buoyed very well at all. These are not charted . People pick up ropes there a lot.
The shallows/shoals between the Noodles and Hurst can make it lumpy in the right conditions. Although not a problem for your craft.
Have a safe trip.
PS I have done Hayling to Poole and back in a day in my little 4.8 ribcraft so your boat will eat it
Ooh forgot to mention...traffic in and out of Poole harbour on a busy day, busyville. Whacky races on the way out in the morning and ditto on't way back in the evening.