Hi dynafire,
When I first started planted tanks a little over a year ago I used the Seachem line. It worked great but as I added a couple of more tanks it started to get expensive. Then I went to PPS-Pro, which worked well but I had problems with plant deficiencies and slow growth. I started the EI method about a month ago and so far it has been the best. I have been having excellent plant growth, including my first Anubias flower. With all the extra growth, I discoved my Ca and Mg deficiencies become more evident, probably due to the faster growth rates.
If it were me, I would try doing some CaCl (Calcium Chloride) and MgSO4 (Epsom Salt) and see it the problem diminishes. I usually see improvement in a week or so after dosing. I dose the above per Rex Grigg's dosing recommendation.
http://www.bestaquariumregulator.com/dosing.html