we also stopped at porto do tarafal on sao nicolau which was fairly sheltered though most of the anchorages
tend to be rolly.
the channel between santo antao and sao vincente can be very tough as the wind
funnels through at 40 knots worth approching mindelo from the north if possible.
other wise porto grande,mindelo best anchorage in the cape verdes,even a marina of sorts good shops and resturants,last time we were there in 2003.
we did the same trip from cape town
,st helena,mindelo,funchal,gib in 89'
managed to fetch madiera,though we had to motor
sail all the way after cape verdes so as to point high enough,left sa in april and arrived in june.