re: Poker & How much should you raise preflop?
I tend to keep my raises between 2.3 and 2.8X. This amount tends to reduce the field a bit so as to not end up in a 5 or 6 way hand while still giving me good value on my premium hands where I do not mind having a person or two calling. I agree that 2X seems a little too small.
I do not change the raise amount based on hand strength. Changing the amount based on hand strength will simply give you opponents information about your hand. Avoid this.
I should state that I only play tournaments, not cash games, so I do make some adjustments. If there are limpers then I raise more. The more limpers to more I raise. The logic behind this is again to limit the number of callers, but also even if they all fold I don't mind as there is a small pot already built. The other reason to adjust in a tournament is short stack play. If you are at or below about 10BB or the blinds plus ante amount to a significant amount of your stack you should be thinking push/fold only.
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