The main question to me that needs to be resolved is this: if you assume a well-coordinated hunter team, can it be impossible - or difficult to the point of being effectively impossible - for a decent Kraken to escape after the dome goes down. Escape, in this context, means breaking away from the hunters far enough to get some distance, eat, or potentially evolve.
Consider Caira’s acceleration boost and Abe’s tracking dart - if the hunters are following and know where the monster is (as may be expected with Abe after a dome), they will have at least an initial boost to following.
The goliath’s jumps and wraith’s warps put near-instant distance between them, whereas the kraken’s boost is slower and relies on the long glide over uneven terrain to slow down the hunters. This will vary by map; some have a further ‘downhill’ direction for long glides; when there is more ‘uphill’ the kraken’s flight will be severely reduced. However the ‘downhill’ maps are also good for the hunters - jetpack boosts last longer during long drops. So the hunters are faster on maps/situations where the Kraken is also faster, to a greater extent than is true for the Goliath or Wraith.
The main tool the Wraith has at its disposal seems to be the Vortex; using it to push back a pursuing hunter team. We cannot assume the whole hunter team will be able to be hit by a single vortex; therefore at least SOME hunters will stay on top of the Kraken. Using Caira’s boost actually increases the chance of the team being bunched up. However the vortex also requires the Kraken to turn and fire, which wastes some of the traversal period before it drops to the ground.
The other distinction that I think is necessary is that Kraken’s traversal depends on staying airborne to cover terrain; which means it is high, visible, and targetable by rails/sniper shots/etc - more vulnerable when running rather than less.
The traversal is largely fine as it is - might increase the height boost or air time a little. However I think the Kraken would benefit from a little extra walk speed as the OP suggested - particularly at stage 1 where using the noisy self-exposing flight is a dangerous thing.
Just my two cents. Bear in mind I’m not an avid Kraken player myself, largely due to bad experiences against good teams that exploited all I have mentioned above.