That's one of those things where it was very inconsistent between episodes, which is to be expected when a show is both farmed out to like 20 different animation studios and is rushed to syndication.
Rather bafflingly, the "Choujin Densetsu Hen" April is almost as conservatively buttoned up as Shredder's Revenge April. (This is the same OVA which has a busty villainess who has notable jiggle physics, so it's not like the animators were averse to perving, either.)
Konami's spritework was the most consistent in having April cleavage.