FYI my starter kit is still going strong

I went with a PT rather than a battery mod (the ego is pretty much a 510 battery mod, albeit an 'official' one) and I got a 5v one of those (from madvapes) as I spend more time at home than out

Some people like the PCC for out n about and as others have said an Ego (or other mod, there are lots of them lol) will definitely give you longer 'walkabout time' than the standard batteries that come with a 510.
Glad to hear your Blu is performing a little better than before, there is something of a learning curve with ALL PV, so expect a 'running in' time for any of them. Once you 'get it' though, things should look a lot more rosy - then its just a question of finding the 'right' juices for YOU lol.
Keep in mind that the mainstay of all PV, the atty, tends to be rather a 'disposable' item. Many will die unexpectedly, for no apparent reason, (some sooner rather than later) some through user error (they are more delicate and fussy than they appear), and some through old age (many people get 4-5 months plus out of one atty). YMMV. Always have spares whatever model you get.
Happy vaping and come back with any questions.