As far as I know the ability to go 61% on small clips is -The- most requested feature.
Since I am here with you for about 3 years I came to terms with the fact that probably we will never get it.
I still think we should get the option with some warning *models might go offscreen and let us choose if we want to take the risk.

Is there a way to modify it by some sort of external program?

it was added almost 2 years ago...
it's a registry tweak

see this post.

https://www.istripper.com/forum/thread/39281/1?post=589738

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not if you Quit iStripper with it below 61%, you will have to Quit iStripper and do the Tweak again.

as long as you have it at 61% or above when you Quit iStripper it will stay enabled.

Small size at 87% is about the same as Large Size at 100%

note; Increasing the Size, adds more CPU Load.

Also See this Post.

https://www.istripper.com/forum/thread/40105/2?post=607055

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Solved, thanks!