Thanks guys! I've been enjoying playing this one again, and love how absolutely manic it gets on D4.
Loving the stats Jry - I think a D4 RBS will probably be in the same range as the other difficulties, although I still think it will be slightly lower. Barra's right in that killing all the bugs on the blue boards is worth more points than the full timer - the issue with this, of course, is the increased risk of losing a life, In my game, I did a mix of clearing the blue with full timer, and by killing the bugs, although it wasn't a set strat I was using, it had more to do with how safe it was instantly spraying Kong to the top with the super spray. I think the extra few deaths you're likely to incur on the blue board killing the bugs will probably hurt any chances of reaching the RBS - if RBS is the goal, I feel like clearing those boards with the super spray is still the way to go, if you can.
Of course, this is all a moot point anyway, because gold boards