Dear Andrey.
I was also playing more than 10+ years on the Tu-154, and later that i became a real B737CL pilot.
Unfortunately i have the same experience with IXEG / XPLN, no matter what adjustments i've made, still it is way too sensitive in the pitch channel.
I've been using my friend's Saitek Yoke, now i am trying to find the proper equipment to buy for X-plane & IXEG 737 to have fun on week offs, if anyone has a suggestion for that proper equipment, in which he/she is completely certain, please advise :-)
All the best,