ballisticlyfast95

At wot b4 the 2 to 3 shift the car acts like its hitting the limiter ,but it's not ,happens at different rpms but about 4000 up wot only have data logged with hp tuners, timing spikes to 40 degrees right b4 it happens,any suggestions ,been on this with my tuners for about a month this is a 98 c5 vette forged 347 ,tea 706 heads,lg g6x3 cam,kooks,varam,ported tb,ls6 intake,a4,3600,and alittle spray