90 kx 125 dog in low gears

Hello. I recently purchased a 90 kx that ran like crap. After some tinkering, I took it to the shop, and 300$ later (they adjusted the power valve..) it's still hardly ridable in the first couple gears. It starts easy, idles great, and in high 3rd gear and up, runs good, but bogs like hell at anything lower. Main jet is 148 and pilot a 52, tried a smaller pilot and it made it worse if anything. Reeds are boyesen carbon fiber, and looked about new. 32:1 or 40:1, makes no difference.. I'm running out of ideas, so I figured maybe someone on here may be able to give me a clue. I ran it down an ohv road to get a sound test, but guess I can't post a link to it here. It's on youtube under SoulsWrath, vid called soundtest. Thanks in advance for any advice.