2) Mini Bumps do not reduce the Base bump power, and I believe that Super Bumps do not reduce it either directly (since they use a Modified Bump Power base_power*0.85super_bumps_last_30_days).
That would mean that Mini Bump power is in no way affected by Superbumps. Is that correct ?.
From my understanding Modified bump power is calculated and is only used for super bumps. If the points users give to topics by mini bumps was supposed to deducted from the base bump power, It would be mentioned by Theymos as it is clearly mentioned for modified bump power which is affected by super bumps.
So,
1. Mini bump power only depends on base bump power. If you mini bump 100 topics, all of those 100 topics will be affected by a same point as long as number of your merits doesn't change.
2. Super bump power depends on base bump power and number of your previous super bumps. (That's why modified bump power has been introduced)