I think the limestone is kind of meh at this point... you obviously are going to make it to harvest.
If you had access to calmag plus, that would be excellent.
In the meantime, some nice boring tap water isn't going to hurt, and now you will remember in the future a couple useful hints:
-RO water needs Ca and Mg added to it
-Tap water is fine!
-Prefertilized soil is very hard to maintain a healthy feeding schedule with
-Soil conditioners that buffer pH right around 6.8 are GREAT and I can't say enough about them!!!!! My current soil mix is simply 40% perlite, and the rest is just plain boring sacks of composted cow manure with ADDED HUMUS to buffer pH... I just get them at the local Agway farmers coop... no pH problems since.. and I could have posted some nasty pH problem pics about a year ago when I literally lost my ENTIRE GARDEN like DEAD to a soil mix with too much peat in it!!!