I have had many issues launching boats and quickly came to the conclusion, with wife's help, that a good steep slipway with plenty of water and protection from cross winds is essential, where she can stand on the side and hold the rope.
As such we got a season ticket for Cobbs Quay, which we thought was worth it because of the number of arguments we avoided, and happily launched our boat there for many years.
It is expensive, but if you use the boat regularly it beats launching at Baiter with no water, cross winds and tides and PWC drivers parking on the slip.
Hope you continue to enjoy your boating what ever way you choose to make it wet
Tony