Cone of influence for higher scales

I have troubles working with conofinf function. It supposed to do a cone of influence for selected wavelet. It works ver well for low scales (1:64 for example). But if I do it for my scales 20:200 it makes very weird coi. Thanks for any help.

cone=conofinf('cmor1.5',20:200,1000,[],'plot');

According to one help here I did two coi, one at first point of my time serie and second at the end. Then I mixed these two coi's together. but the result is a bit the same and still sugests that almost 3/4 of the scalogram would be just edge effects.

cone = conofinf(wname,scales,LenSig,[1 LenSig]);
cone = [cone{1}(:,floor(1:LenSig/2)) cone{2}(:,ceil(LenSig/2):end)];