rex u.k

hello everyone,i just rebuilt my engine and the oil pump is bordering on the limits of max tolerance so i'm thinking to switch to a high vol.pump instead of putting a std. unit in, anyone using this type of oil pump? the reason i ask is because although high vol. pumps provide more oil/pressure they are known to make engines leak oil due to the higher pressure anyone notice this? or shall i just put in a std one? thankyou to any replies. pics soon too!