I don't know the answer to the TT qn - I really don't know whether the high point would reset or not - it might not.
Do you mean to TT back to before the tourney starts? Unknow territory for me.
There is another way, tho it depends on how high that high point is currently - get a visitor over to donate bugs - if they go over that high point you set (& also if they go over I think its 80 points) they will get bug furniture which they can drop for you.
I do this all the time with my own games - it makes the whole business less frustrating, but then later on I do a tourney for fun/more legit. Well having a visitor over isn't cheating, but it certainly makes the thing easy.
If you are on now & want to try this I am willing to come over - it depends on how high your high point is - I collect birdwings for this purpose. (& I have some in stock, they vary in points from around 80 to 126ish) - I am in 2013 ingame but that does not affect either game.
I'll be on for around 30mins from now - its 11.06am my time - I can't remember how messages work on BTF - I'm on gamefaqs same I/d. but will check back - no probs if you would rather wait for an answer to the TT qn - I presume TT back would not adversely affect the high score or the tourney, albeit it might not lower it. But I don't know.
Or you could freeze time and get another player to do similar to what I suggest.