I'm on 33 and while the drop rates are not as high as the lower servers I'm still getting 1-3 medals a day. Roses and crosses mostly in 1-3 levels, lions in lvl 4-6 grasslands..LOTS of attacks to do it but I send out 6 attacks at a time and usually have a medal within 4-5 sets of attacks. Sometimes I conquer sometimes not, it doesn't seem to change the drop rate