You cannot get more lather with m&p , the oils and lye have been saponified and there is no lye left to mix with oils to make more lather, as far as the milk, you also cannot add liquid to m&p it will cause it to sweat or something, you can add oil about 1 tb per lb i believe but it will decrease the lather. So my advise to you is to switch from the shea to goat milk base. Shea is more conditioning and has a creamy lather. fo about 1 tb, depends on how stron scent is Essential oils are less 1 tsp per lb of soap base check out whosalesuppliesplus.com under soap bases and each one has directions as to how much additives and such. Also, check with company you bought soap base from.