I've noticed the same thing at home get around 5 meg where it used to be 20. Can't tell the difference unless you run speed tests though as even 2 meg is plenty for Netflix or YouTube.
Picked up full lte reception in downtown St. Pete at central and 4th st. Speeds were over 20mb down. Not sure how new that is but wasn't there last time I checked a few weeks ago.
I was at the trop for a game about a month ago for a rays game, there was LTE with decent reception but I couldn't use any data it was completely dead. Had to switch to 3g only mode.
http://db.tt/0eg61WXW
Something odd happening today. My speeds are what appears to be throttled to right at 2000kb up and down. Tested on several sites from Clearwater to Port Richey.
It's hard to keep track of new towers when they just improve coverage in an area already covered by a further away tower. I have noticed improved coverage around ulmerton and 66th and also along east bay.