If the charger works with other batteries there's nothing wrong with it. Yes there are faster chargers on the market but remember, the faster the charge, the shorter the lifespan of the battery. As you already know from your RC Lipo packs heat and battery longevity don't mix. I think a 1A per battery charger is a good balance. There are 2 and 3A fast chargers out there but you will be buying replacements more often.
The problem with 18650s and other can sizes is rewrapping of B and C bin batteries is rampant and in some cases you have zero idea who the original manufacturer was. Those brown batteries should be from LG but are among the most commonly counterfeits on the market. EBay and Amazon (third party sellers) are simply untrustworthy. Unfortunately those same problems end up in retail vape shops as well, along with rewrap names like Efest or Imren. You have no idea what's under the shrink wrap.
If you want a new charger sure, why not. But I'd suggest getting all your vape batteries from reliable sources known to only sell authentic Sony/Murata, Samsung, LG, and Sanyo batteries. In the US places like IMRbatteries, Liion, Illum, are the best sources. Shipping is a little long due to battery shipping restrictions (same on your Lipos) but the price on the authentic is usually within a dollar of the fakes, and not uncommonly on the cheaper side of it. I imagine the hobbyist retail stores you deal with do a good job on the Lipos they sell, unfortunately the 18650, 20700, 21700 type cans typically used in vape mods are a lot more problematic.