Getting the final bury on a double-braid can be tough but I've always thought it was supposed to be. I wouldn't want the final stage of a splice to go in easy because I would worry that it could come apart just as easily. However, snapping and jerking the line to set the splice seems to take a toll on my wrists and shoulders pretty quickly. I'd like to try using a technique which would incorporate a simple mechanical advantage (5:1 or maybe even 3:1). This scenario would require two people but could also be done solo.
Picture this:
The line would be set horizontally between two anchors with the m/a set up and the "throat" of the splice resting on a flat, firm object (tree stump or just a wide round). Of course the splice would be buried as far as possible (comfortably) by hand in the usual way. Then, one person would put steady tension on the line while another person would gently hammer on the splice with wooden dowels as if they were playing a drum roll.
If all goes as planned, the splice would work itself all the way home because of the combination of the tension and the drumming.
The drawback though, is that it would require having (at least) one friend. : /