A Centurion Eclipse from around 2,000 to 2,002 has a flat and soft slalom wake. Excellent boat for kids and 15 off. Excellent at the speeds you want. It really should work well for you.
I have owned/used multiple MC’s, Nautiques, and Centurions over 30 plus years. Have been involved as a boat dealer with all three.
I still have one of these. A 2002 with a 5.7 fuel injected Mercruiser. It is the one the kids, grandkids and wives really enjoyed. So we still have it.
Has never had any maintenance issues. Water pump system is durable. Has never had a day out of service. Change oil annually and go.
Not promoted a lot. Not well known. Not expensive and worth looking to find one. Expect to have mine for many more years.
Still have two other slalom boats. Much newer. Zero off 6.0 etc. Nevertheless when 8 year old granddaughter goes today this boat will get the call. Same when niece arrives. Same with other kids around bd the lake that request this “boat and old driver” rather than their boats.