European Foul up

I'm gonna post this question after I lay out some ground work of where I'm at with the condition of my hives. Bought two, 3 lb packages and installed 4/4/14. Running 8 frame mediums with screened BB's. I've been feeding 2:1 with Bee healthy. Of course one is doing much better than the other. Here are the stats;
#1 hive has grown substantially in the last 4 weeks. 5/8 frames almost completed while the last three have small comb on them. Plenty of capped brood and and emerging brood. Queen was last seen on 4/29 and eggs and larvae were noted to be in different stages of development. This hive has stopped feeding. I see nothing wrong with this hive and leads me to believe they are healthy and strong however some larvae were seen on the bottom screen. Very few mind you.

#2 hive has grown quite slowly and 4/8 frames are partially filled. Same feed as #1 and this hive has continuously fed since the install. This hive was noted one week ago to have plenty of brood in what comb it did have. The queen was spotted 4/29 and was active. The comb has grown very little in size for the last two weeks and on 4/29 I noted dark larvae in one cell. Now this did cause me some concern and I began to research EFB. Now I am seeing more dark/dead/flat larvae on the SBB in this hive than hive #1. Additionally dead larvae were noted in the cell and were flat. Some of the cell capping have become a little bit darker and some have holes in them. I can't tell if they are emerging or dead. The bees seem a bit restless but have grown in population.

I still have the same sugar syrup on both the hives I started. Should it be changed and whats the shelf life in the field for 2:1?
Thank in advance for all your input and feel free to ask questions to help clarify the issue at hand.
A11