Rogue/Assassin 2024 : Surprise Strike

Hi Everyone,

i would like to have your feedback on this,

So the new surprise strike , give a flat damage equal to the rogue level. My player are really sad to not roll dice anymore. 

Therefore, i was thinking to replace the flat  damage output, by :

" you roll additional a number of D4 equal to your sneak attack dice  minus 1, up to 8D4". 

That's give : 

LVL 3  = 1D4 , LVL 5= 2D4; LVL 7=3D4; LVL 9=4D4; LVL 11 = 5D4 ; LVL 13= 6D4 ; LVL 15 = 7D4;  LVL 17 =8 D4 "

If you look the mathematical output, you do a little less damage at level 4 and 5 , but you do a little more damage at level 15.

What do you think ?