When I started casting about 25 yrs ago, I bought the Lee Pro 4-20. Yes, it dripped some but not excessively. About 10(?) yrs ago I found a RCBS Pro Melt 220V unit on sale(clearance?) at Midway. Since I had 220V service in the shop, I jumped on it. I use both but mostly the RCBS.
I agree that the mold guide is not the best(far from it) so I fabricate my own for use with 4 cavity molds. These guides are usually just 2X4's milled to fit the mold in question. The RCBS lends itself to this solution since it is open at the back.