All you really need is a cheapass ppm meter - paid like $13 for mine- amazon i think. You just take a reading of your water as it is & then take another reading after mixing up your nutrient solution- subtract the first number you get which is your water ppm & you'll know what ppm your nutrients are mixed to. Easy breezy.
Either way you measure up your nutes a stronger mix will not positively affect the plants in fact you will be more likely to "burn" them that way. Nothing you dump on them that comes from a bottle will increase mass or grow more or better buds- it is the lighting, nodal thickness, and time in veg that governs yield & plant mass. If you want an even canopy with buds all the same size you'll need an hid light with a hood to deliver a more even amount of lumens to your plants which should be trained & positioned underneath to recieve the photons it emits. A couple cfls work great for vegging small plants but cfls need to be too close for them to be effective at flowering buds. Upgrade your lighting & train your plants for an even canopy & you'll get bigger buds all the same size. Growing from clones also helps as plants from seeds take too damn long.
