Your object looks symmetrical. Try manually to create surface
p1 = isosurface(...);
p2 = isosurface(...);
v1 = p1.vertices;
v2 = p2.vertices;
ix1 = v1(:,3) > (max(v1(:,3))-0.05); % find z coord of boundary
ix2 = v2(:,3) > (max(v2(:,3))-0.05); % find z coord of boundary
[t1,r1] = cart2pol(v1(:,1),v1(:,2)); % extract data first contour
[t2,r2] = cart2pol(v2(:,1),v2(:,2)); % extract data second contour
ind1 = sort(t1); % order points counter clockwise
ind2 = sort(t2); % order points counter clockwise
% data can be of different size. Interpolate data to make the same size
r22 = interp1(t2,r2,t1); % make two contours same size as second one
x1 = v1(:,1);
y1 = v1(:,2);
z1 = v1(:,3);
[x2,y2] = pol2cart(t1,r22); % second contour
z2 = z1;
% create data for surface
X = [x1(:) x2(:)];
Y = [y1(:) y2(:)];
Z = [z1(:) z2(:)];
surf(X,Y,Z)
