Hey Alan,
Its will just give more range for EA studio to work with and find strategies. If you are getting plenty strategies for certain symbols then you could reduce the range a bit for those symbols and vice versa for the ones not getting many strategies.
Start with some general settings and tweak a few things for each pair. You could for example increase these ranges as suggested if not getting many strategies and if still at 200 and getting no strategies you can then start reducing the strictness of your acceptance criteria in stages, for example reducing your 300 trade requirement OOS to 200 trades and see the effect.
Take note of what works well for each symbol so you don’t have to repeat the process as it may take a week or two.