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I check if I am against >3 opponents and I don't catch anything. I bet 100 % if HU, 99 % if against 2

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That's pretty rigid, and you're overlooking other important factors, namely the character of your opponents and the texture of the board. This thread with some advice from Deception5 gives a good idea of what you're looking for, though it isn't quite as broad as you may need.

Also, I'd be very surprised if you really are against more than three people and missed the board 14% of the time. I guess it's not impossible, but a reasonable amount of your raises should be with pocket pairs, so missing the board isn't an issue, and are there really that many >3-handed flops in 6-max when a raise is put in? If so, I need to switch sites.