There's no difference between the black tigers and normal ones, except its colour offcourse, lol!
Spod, didnt u say something about coming down here in April/May to fish with me? i'll get you onto tigers quick-quick bru! lol!
Lunker, the truth is, I was the same with boilies than what Spod is with tigers... battled to get confidence in them...it took me a long time to work them out and gain confidence in them boilies. But over the last 2 years I've caught a good few carp, some of my biggest as well on boilies. When you know when to use boilies and how, you tent to use it less, but have more success on it when you do use it.
A few weekends ago, I had 2 of my 4 runs for an overnighter, on boilies. Landed 1 of them, a nice fatty, and lost the other (i suspect my hooklink was too long)... the other 2 fish came on, TIGERS, lol!
Just4fun, if you get stuck on obstructions like rocks etc, next time you fish there, just move a little up the bank, so that you are fishing near those obstacles and not in it. Watergrass is actually good as it gives the carp safety/place to hide and it holds food, but can be frustrating... have you tried just tying on a P4 or P5 weight to the end of your line, cast in as far as you can, and drag the weight along the bottom, back towards you? You should be able to feel when the weight slides on the bottom freely, and when it gets stuck in watergrass. The idea is to find these areas where your weight slides freely, cos those are open areas either behind the watergrass beds, or inbetween. If you can find that, spod some bait out onto the open area, and fish it... should work. The grass also only grows up to a certain depth, depending on how deep the sun is able to penetrate...so find where the watergrass stops growing, and fish just past that in a little deeper water... The fish should use the end of the watergrass as a patrol route...
hope that helps?