I have never used Bullplate and won't knock it as many have reported success with it. What I have been using for quite some time is Klotz KL-350 synthetic 2-stroke oil. (My other passion is R/C aircraft and these burn gasoline and 2-stroke oil. So I have pints of this at my disposal.)
I use a syringe filled with oil and the needle is blunted on my grinder. A small drop at each hinge, index points and a very light smear on the sprue plate do wonders.
I have cast 1000's of 9mm and 40S&W boolits and the molds are better than new. Sizes are correct and I can keep going without stopping to fiddle with anything.
No offence meant, my 2c is that if Lee molds don't work for you or last then you are probably doing something wrong.
Bliksem