To answer your earlier question the general rule of thumb for Estes igniters and newer pyrogenless Starters is 2amps per igniter.
Over the years I've built many controllers with internal and/or external power sources. While just about any bare Nichrome 30ga igniter or starter wire will glow red hot on 6 volt batteries the use of Carbon or alkline batteries is regularly given the thumbs down as shorting these and 9v batteries severely damages the internal power creating chemistry of these batteries.
It is hightly recommended that a simple 12volt 7amp/hr or higher Gel-Cell or Sealed Lead Acid battery rechargable battery be used as these will deliver pleanty of power to single Starter/igniters or Clustered Igniters up to 6 with no trouble at all. I've used these small 12v - 7amp/hr gel-cells avaialble from just about any RC hobby store for decades. The first Hobbico lasted almost 24 years with nearly constant weekly used and recharging. I believe the currently sell for less then 20.00 bucks and can be recharged with any 500ma to 1amp 120/12 volt wall pack adaptor. Simply remove the plug and replace with a couple alligator clips. (see photo/tip below.)
A couple things you don't mention:
What gauge "Stranded" copper wire are you using for your 25ft controller leads? I strongly suggest 16ga stranded copper Lamp cord or Zip cord if you can find it locally with the white jacket rather then brown. Much less of a trip hazzard
What is the amprage rating of your 4.9v batteries? If I were building this controller instead of using 3 in series to give a 14.7v supply I'd go with an external drop cord (same 16/2 Lamp cord with alligator or 30amp battery clips) and get that 7amp/hr 12v gel-cell
Since we don't know what the Amp rating of your 4.9volt batteries, it really doesn't make much sense to parallel them, 3 or 4 times 0 is still 0.