I’m not too sure if I get what you mean - if ihe issue is striking you could always practice the motion of chi-to-shan, which I detailed over in Robert’s thread about hitting the third string
Here’s what I wrote about that:
“The idea is that you (when playing in ushirobachi, or the lower part of the dou) put the bachi against the string, and scrape it off and down, and then lift it up to let the note reverberate. Same thing in maebachi (the position at the top of the dou) but there you keep the bachi “glued” to the dou before the next strike.”
If not that, could you maybe post a video of the problem? If we can see and hear your technique it would be easier to figure out why it sounds weird.
Also, tsugaru strings typically hold up against pretty rough playing, so I don’t think you’d have too much to worry about with them.