to bring up the lemon juice thing, unless you are measuring the acid level of your must as you add it, or like you said you were aiming for something like strawberry-skeeterpee, i would suggest using powdered acid because then you have a control on how much acid you truly add. lemon juice might be different levels, and amounts.
color wise i have never used Lallzyme EX-V, so i can't comment on it. I have always just added raspberries to get the color. The color change is caused by oxidation if i remember right. it is extremely sensitive to it, and it doesn't change the taste much if any, but it affects the color. supposedly ensuring you have adequate amounts of campden, and use citric acid the color will stay better. i have never gotten it to work, but i know people have.