I think a good conversation with your instructor is in order. You have questions, and frankly, your instructor can be answer them, particularly as they pertain to your training.
I do want to comment on this remark, though
Doing a technique "slow and soft" doesn't limit its effectiveness at all. If you can do it perfectly "slow and soft" then speeding it up and powering it up will happen when the need arises.
One would have to train at the appropriate speed to perform at that speed. For example, if making a nice tennis forehands "slow and soft" with perfect form is all one does, you will not be able to return a serve at Wimbledon.
Having said that, it isn't a good use of training time to jump right in and attempt to play tennis at Wimbledon levels. One has to work progressively to get there.