I'm sure I've mentioned this before but this is the first year I've gone into this in a big way and believe me it really does work! Leave some of your toms to develop a few side shoots then remove them, either pot them up or if they are quite big and tough (from those naughty ones that got away) just shove in the soil and water. They'll droop for several days but even under warm conditions you'll see them start to right themselves - quite amazing actually. I've even seen side shoots that I picked off and dropped on soil start to root!
My first Sungold side shoot toms are starting to ripen up and the others are coming along very well and they are much bigger and chunkier and further advanced than the spindly things I grew from seed, before I propagated half these side shoot ones. All of this was done since beginning of May.
And I would also like to state that Epsom Salts really do work as well - first time I've ever had toms with green bottom leaves!

I gave them all a liquid feed with it as I didn't want to spray them, and the last two side shoot toms had it sprinkled into the planting hole.