How to compile the kernel just like how pfsense has it?

Tantamount

So, I had an issue where I needed to disable a driver that's compiled into the kernel. I assume this meant that I needed to recompile the kernel.

I think I've done this correctly, but wanted to verify with others here since uname -a is returning a version less than p25:

Here's what I did from a clean FreeBSD 10.1 vm install:
(as root)

mkdir /usr/local/src
cd /usr/local/src
git clone -b RELENG_2_2 --single-branch https://github.com/pfsense/FreeBSD-src
cd FreeBSD-src
vi sys/amd64/conf/GENERIC

commented out line 207:

#device em # Intel PRO/1000 Gigabit Ethernet Family

make buildkernel
make installkernel

I then renamed the /boot/kernel directory on the pfsense system and scp'ed the /boot/kernel directory that was created from the 'make installkernel' command.

I then compiled a newer driver against the FreeBSD-src git branch:
ln -s /usr/local/src/FreeBSD-src /usr/src
(Download drivers from the internet and put in /usr/local/src/em-7.6.1)

cd /usr/local/src/em-7.6.1/src
make clean
make

copy the resultant if_em.ko file over to the pfsense's /boot/kernel directory.

Finally, I added this to the /boot/loader.conf file:

if_em_load="YES"

and rebooted.

Did I miss anything? According to this page:
https://doc.pfsense.org/index.php/Versions_of_pfSense_and_FreeBSD
the kernel version should be 10.1-RELEASE-p25, however, after reboot, uname -a shows:

FreeBSD pfSense.domain.com 10.1-RELEASE-p24 FreeBSD 10.1-RELEASE-p24 #1 a595f80(RELENG_2_2)-dirty: Thu Mar  3 21:39:01 UTC 2016     root@:/usr/obj/usr/local/src/FreeBSD-src/sys/GENERIC  amd64

p24 instead of p25? Did I check out the wrong branch? Any other gotchas? There seems to be WAY more kernel modules in /boot/kernel than what comes from the pfsense 2.2.6 distro. Is there an official 'make' command I should be using when compiling the kernel?