Modifying the 10+1 strategy for higher levels

[mythrilfox]

I played the 10+1 sngs for quite awhile and was very successful. Lately I decided I had the bankroll to move up to the 20+2's / 30+3's, and they seem markedly tougher. I am now barely turning a profit and was making much more at the 10+1 level. Is a strategy adjustment in order? If so, what kinds of things must be considered at 30+3 as opposed to 10+1?

(BTW, did a search for something like this but nothing turned up. Sorry if it's been done before.)