What are those tomatoes? Roma's? How many plants do you have in there ? And did you grow some outside the high tunnel to compare flavor? I have found the more direct the sun the better the taste, also found that this "fish fertilizer" they are pushing for "organic" is horrible!!! You actually can taste it in the veggies and fruits! YUCK!!
How are you watering? Drip system? Also curious why you use straw? Out here that stuff is expensive! And makes a mess.. I have tried it and had poor results , especially on tomatoes.. So i now use the plastic mulch with a drip tape. Outrageous results, too. The mulch keeps them dry ontop and moist and warm at the bottom. And they even have red for tomatoes.. A university study found tomatos did a little better using this red color , i dont use it, but may give it a try some day to see for myself.
Our tomatoes are Health Kick (Roma's) Celebrity (Medium Slicing) Big Boy, Parks Whopper, Big Beef (sandwich tomatoes) Juliet's (large cherry tomato). We have the most Roma tomatoes because we do a lot of canning.
We have 101 tomatoes, 60 broccoli, 60 peppers, half row of carrots and a half row of lettuce (1 row is 65' long).
We didn't grow any tomatoes outside the high tunnel, they should taste fine because the ones you buy in the store are grown in hot houses and are most likely grown in hydroponics. They are also picked green and sent from who knows where to be sold. The high tunnel is completely opened up during the summer and it will only be closed up in spring and fall to extend the seasons. We used fish fertilizer one year when the plants where only a few inches tall. We don't use it because it is made of ground fish and it seems like a wast of food. It also seems cruel to grind fish alive.
Right now we are needing to set up a good watering system, we have all the plans to do it but we are lacking funds. We are just using a garden hose and a watering wand. We make sure not to get any water on any leaves of the plants to help keep down diseases. We want to set up drip lines on all the beds plumbed into shut off valves for each bed along the wall. We are also going to set up a water retention pond and have the high tunnel/shed/house gutters drain into ditches so we can then water with rain water instead of well water.
We get all of our straw for free, we got 15 round bales last summer for free from my boss, we can get more from a friend who bales up a ton of straw for his own garden and he puts some up for us too. The straw seems to work great, it's good for the soil when it rots down and it keeps keeps the ground moist plus it keeps out weeds. We just till it in at the end of the year and let it rot over the winter. I have heard of using beat juice and newspapers under tomatoes. I have heard it works well.