Whitewood,
Because weight has it's biggest effect on the tips as you know, then it's best to go a light as possible towards the tips. That being said, any Wood that is not working wood can rob energy, but must be balanced with safety. Hard woods (Osage, Guava and others) can generally go smaller tips then white woods because of strength and hardness. Also deeper and narrow is generally better the wider and thin ,on the tips. Thin to to the point where they are as thin as possible without bending is a good rule of thumb.
Looking at those tips here are my thoughts. They are fairly good but if you were going for maximum performance they could be a little shallower on the top. there is some excess wood on the feather in to the limb before the string grove. Also a point vs. a square lead in to the knock will allow even more wood to be removed.
Depending on what wood it is, you could probably go just a touch narrower for about 6-8 inches out from the tip. Of coarse without knowing the wood or seeing a relaxed,braced and full draw it it hard to say where the threshold of the safety margin is. Hope that helps.
