1) That is weird, it should always work with both. UNLESS its a Forestry Squeezer Recipe which GT6 copies only to the GT6 Squeezer but not the Juicer.
2) Try putting Iron Ingots in a 3x3 on the Crafting Grid like their Tooltip tells you? I had to kill the NEI Crafting Recipes because of massive Lag Reasons.
3) The Efficiency Percentage is only for Info purposes and never "applied" anywhere. You have Input and Output and those scale linearly. For example, the "proper" Steam to EU ratio is 2:1, but you obviously see a 3:1 Ratio from the Input/Output, that makes 66% Power Efficiency, or 33% of Power wasted.
1) Yep, it is exactly that.
2) Oh... I've seen that line of tooltip so many times that I stopped paying any attention to it... Thanks!
3) Ah, I see... Thank you for clarification!