In quick css, i wrote :
h1 {
font-style: italic;
font-weight: 900 !important;
}
h2, h3 {
font-style: normal;
font-weight: 600 !important;
}
h4, h5, h6 {
font-style: normal;
font-weight: 400 !important;
}
.template-page .entry-content-wrapper h1, .template-page .entry-content-wrapper h2 {
text-transform: none;
}

Then you can manage as you want weights…

@IT-Ability

how do you solved it? Have same problem, and (paid) support is too long…

thanks