Tranny Flush?

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So, I bought the 78 with a very small, tiny tranny leak.

I don't think it's gotten bigger, there is only oil under my car. I check by
wiping my finger across the spots and checking for red.

I do add tranny fluid every couple months, not a lot, but enough to keep it between the lines (yes, at temp, running check).

It's been sitting through the summer, I've been scooting around to save $$ and diesel is over $4 here. I got and installed a new brake master and have been driving it daily.

When I first start driving, the tranny takes a click to get into gear and it's pretty slow to start (tranny has always liked a warm up period before moving though) and is slow to change into second. It doesn't rev really high or surge, just slow. And other small funky things. When it warms up, it seem to be fine. It upshifts fine, then downshifts fine.

I was thinking of doing a tranny flush and all new fluid. But I'm afraid with a small leak that the pressure of the flush will make the small leak bigger.

Any ideas you'd like to share about the tranny in general, why it may be slow to upshift into second? Currently the tranny is showing a level right between the two lines, so I'm good on fluid.

Thanks!