The recent system of the BOT type and their stats aren't balanced; Sugre's stats are way too boosted than others.
My theory is:
Stats should be distributed equally to their respective BOT's advantage.
To clarify this, I'll say how it should be done. Each BOT type should have the same ratio of their BOT's respective stat advantages which is to be increased. In this way, keeping the stats in a fixed ratio same for each of the BOT type, every BOT shall be balanced.
For an example; let's say a BOT type will have "X" value (X= basic stat without regarding the BOT's advantage stats). So surges will have 10% (% is an example) more (only evade, speed, and gun damage) of "X" than Rams and Patches. Likewise, Rams and Patches should also have 10% more (only of their respective BOT advantage) of "X".
There's one more thing. Normal/OP items should have stats in an equal ratio of the BOT's advantages. Every item should be equally benefited to all the BOT type.