Actually, I am with EFA too...As @Tirreggregars said, a sorrow is one solid combination of a weapon while using EFA... And if you change to savior resistance, supreme cannon or another sorrow can do the trick.
But I DO DISAGREE with another bassalt dissolver... You won't even get the real opportunity to use those, and even if you do, those are one time weapons only... Mind it... Technically then you could fire three turns without much damage.... But by that time, a physical mech using only one Armor dissolver can kill you....I strictly disagree with the idea of 4 one-time weapon use.
Using another bassalt dissolver will just not cope with your intention of being a heat mech..(as the heat isn't going to rise that much and with someone having 400+ heat and 150+ cooling, and being a physical mech, you would definitely lose)...
You should atleast have two weapons whose ranges coincide so atleast you don't have any spare turn...
Plus, if I were you, and I if my second mech was heat one too, I would have preferred to use one bassalt dissolver against one mech...
I would like to say one more thing, if you use energy free weapons, you will have another great advantage... You heat goes above 500, you HP goes 300+, and your cooling, even using an heat engine is more.
Now it's your mech @pinkpony24, do what you want to do and try out every single combination. You will find out yourself.