Since you've already gone down the path of installing the boom amp and flashing it, start with replacing the speakers with something that are 2 ohms boom or otherwise. you won't get loads more volume with the boom amp but you should get some and definitely shouldn't' be losing any volume. If you don't like it after you change speakers. Like others have already mentioned, start over.

 

Sadly, your components as others have mentioned, are not compatible. You need to take a step back before investing any additional funding and ask yourself, do you want an OK (BOOM) sound system or do you want a Good (Aftermarket) sound system.
using the Boom AMP & 2 ohm speakers is not going to provide the better of the two. You will notice many BOOM parts being sold and there is a reason for it.
your going to take a loss, whether your buying new amp or new speakers its a loss, personally I would invest in a new amp.

 

To pile onto this thread

1. The eq flash from techno research has absolutely zero to do with the amp, whether it's boom or aftermarket. It only changes the head unit internal file.

2. The boom amp needs a 2 ohm speaker. Rated at 75 x 4 at 2 ohm and you're running a 4 ohm setup which is giving you approximately 37.5 watts give or take. No bueno.

3. JL audio is great. Except in a fairing. They flat out suck. They have a low sensitivity which means they won't get loud without proper power. I've seen a lot of guys run them with zero success.

Change your strategy. Go back to the drawing board.

 

FYI - the boom amp themselves can be flashed although I'm not sure of the purpose of the flash, but I do know it doesn't have anything to do with the head unit's EQ Curve, etc. Perhaps the amp flash was/is to correct issues (ie; software update). Not sure if the techno-research tool is capable. Here's some info from the Boom Audio Amplifier kit instruction sheet...(apologies for formatting).
Load amplifier EQ based on speaker configuration using amplifier flash section of Dealer Service Tool (DigitalTechnician).

a.Check for updates to the Amplifier Base Calibration.
b.Install newest version of Base Calibration, if updatesare available.
c.Proceed to radio reflash and select the new speakersconfiguration.
d.The correct EQ based on the speakers configurationis available in the information section.
e.Complete the reflash of the radio with the newspeakers configuration.
f.Proceed to Amplifier reflash.
g.Load Amplifier EQ based on speakers configurationas noted in the radio reflash section.
h.Complete the Amplifier reflash.
12.Follow the service manual instructions to install the airduct, outer fairing, tank and seat.13.Refer to Odometer Self-Diagnostics in the EDM to clearany codes that were set during the installation.4 of 6-J05788

Clearly there is a separate section and process in the H-D digital technician software for amp flashing. I'm also not sure that these amps are capable of 2ohm operation only. The H-D factory lowers speaker install kit requires the install of yet another amp (Boom Amp). This amp is the same as all of the other Boom Amps (Fairing, Tour Pack, Bags, etc.) but yet the speakers in the kit are listed as 4ohm. I suppose it could mean that it's a 2ohm amp driving 4ohm speakers which definitely isn't optimal, but it could also mean the amps are capable of 4ohm operation. Unfortunately I haven't found a lot of solid info on the Boom Audio Amps in the way of technical details.

Having said all of that - I would say that after having gone down the Boom road for a number of years (4 amps, 8 Boom II Speakers), I'm a lot happier now with an aftermarket setup.

 

Let's say for sake of argument that the Boom amps can be "flashed" for some reason. That means they're now a flashed POS. Any amplifier can operate on a higher ohm load than designed. It's electrical science, but it creates the law of diminishing returns. The boom amps are meant to play with boom speakers. That's it. Can they work with others? Absolutely they can, but why waste your valuable time and money. They're underrated, overpriced, and just not worth it when trying to get quality audio on your sled. If you're going to spend the dough on quality aftermarket speakers, be prepared to purchase a quality aftermarket amplifier to drive them.

 

Oh I totally agree - which is why I no longer have Boom audio .