Expectations for 8-tabling...

[MrStretchie]

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If you are beating 2/4 on 4 tables, you should move up.

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The thing is, being able to make decent poker decisions quickly and split your attention is a significantly different skill than being able to make very good poker decisions. There are definitely players who can make far more playing (say) 1 10/20 table than 5 2/4 tables. The reverse is also true.

However, if the OP is in fact making 2+BB/100 at 2/4, regardless of number of tables, he could probably beat the 3/6. Therefore he would likely improve his winrate more by focussing on the game, moving up, then adding tables.