Here's a link to some EI information. Midway down the page there is a section in Bold type titled "A Typical Dosing Routine" that gives you some info for dosing: http://www.barrreport.com/forums/showthread.php?t=1
To sum it up the article for you, the recommendations for a densely planted 20g tank are:
1/4 tsp KNO3 3-4x a week (every other day)
1/16th-1/32nd tsp KH2PO4 3-4x a week (every other day)
5ml of traces on days opposite the KNO3 and KH2PO4
SeaChem Equilibrium 1/8 teaspoon after water change.
With our fairly hard water here, I skip the Equilibrium addition. Up here in Dayton, we have a decent amount of Ca and Mg in our water supply so I don't think it is necessary. The extra K and Fe in Equilibrium may or may not help help but I've never tried so can't say for sure
Based on a 100g volume for your 2 tanks with sumps, I would add 1 level teaspoon of KNO3 3x a week and a level 1/8 to 1/4 tsp of KH2PO4 3x a week and add 20 ml of trace solution on days opposite the KNO3 and KH2PO4 additions. Quit testing the tanks (except for CO2 levels) for a week or two and give it a week or two to "grow in".
I would follow the 20g dosing advice in the EI article for your 29g tank also. I think you are definately overdosing the PO4 on the 29g. Make sure your CO2 levels are good also. We seem to have some issues with phosphate buffers being added in the amount of 6-8ppm in the Dayton area. That PO4 addition makes us think our CO2 is higher than it actually is