I hope you have solved this but if you haven't, try this:
.ui-tabs .ui-tabs-nav li.ui-state-active:hover .ui-tabs-anchor {
background: #43a8da;
background-image: linear-gradient(to bottom,#6db3f2 0,#54a3ee 30%,#3690f0 68%,#1e69de 100%);
color: white;
}
Or this:
.ui-tabs .ui-tabs-nav .ui-state-active:hover .ui-tabs-anchor, .ui-tabs .ui-tabs-nav .ui-state-active:hover {
background: #529DCC;
background-image: linear-gradient(to bottom, #6eb4e0, #529DCC);
color: #fff;
}
Both should work the same as you intended i.e. on hover / mouseover, only highlight the active button.