An NPK of 2-8-5 isn't so bad for Tiger (as long as your not adding any more NPK value supplements).
Still, if you do get yellowing from the bottom fan/stem leaves and it progress's up and out the branching. It's to much P and not an N problem.....Too much P can block K and limit the uptake of Zn. Not good in flower.
Dyna-Gro, grow formula works very well start to finish.....I would run a Silica with that to aid in the regulation of P and for other reasons too. Damned simple way to grow if you want to use synthetics...very cheap in the long run.
Hesi (soil formula) Grow and Bloom works well also.
H&G has to many parts and you always have to up the formula.....It's too damned expensive that way.
Don't care for DM.
Canna and Hesi are Damned good lines,,,,Canna ain't cheap....