Yes, a “high tension” string is a likely to be a better choice than a “low tension” for the reason you said.
The La Bella 10-String Classical Guitar Set 10BT, 10MT comes to mind as it has 4 additional bass strings.
Another thought is to use “Extra hard tension”; The D’addario SCX-3B set contains 3 such bass strings.
Hope this helps, let me know either way…
Classical Guitars Plus
Natson Mill, Bow, Devon EX17 6JE, UK
On 18/03/2021 22:47, Richard Youngs wrote:
I am experimenting with tunings on my classical guitar, frequently down-tuning several strings an entire tone – the lower E has been as low as a C. Can you recommend a string set that would suit this? Am I correct in thinking I should be using high tension to avoid the strings being too loose? Any brand in particular?