TIME REMAPPING/TIME RAMPING

I'll make this a simple question lol. OK, time ramping I want to preform is, in one clip, that I found impossible 2 do, I want to ramp up speed of clip from 100% to 1020% in a 1 minute  then stay at 1020x until the last 100 seconds then ramp down to 100% so as to be in "speed sync" with the next clip. I found that impossible to do because I think PP thinks I ran out of video in the timeline so it shows black (it may be a fact). I just cant do a ramp up then a ramp down on one clip.  SO! My work around is, since I have no problem with the ramp up to 1020% and the problem starts after last keyed point of that 1020% ramp up, my program monitor goes black. So the work around is to cut at that 1020% point(where the monitor goes black) and then for the duration of the portion I want at 1020% I just use the regular speed/time adjust. The ramp down I manipulate the 3rd clip which is at 1020x speed (that matches the previous clip speed) from 1020x down 10% using the ramping feature. For some reason the monitor doesn't go black again. So I must NOT have enough video to accomplish "my mission"lol. It took me hours but I finally got what I wanted but  I had to cut the clip into three so I could have a ramp up on one clip, the 2nd clip was a simple sustained speed situation and the 3rd clip had the ramp down so as to match the next upcoming clip. WHAT A MESS!

Now my question to the community is IS THERE A SIMPLER WAY OF DOING a ramp up, speed sustain AND a ramp down all on one clip only! ?

I think I see whats happening but its really hard to munipulate time with such crude tools. As u know u cant type in a speed or time in for time remapping its all done graphically and thats very hard to accomplish. 

And my really big problem is I must do this again and again and I cant nest it b/c the times are slightly differant. 

PP is a great tool and I enjoy it for about 4 hours everyday for 10 yrs now but the learning curve is worse the AE @ times. But I set a goal for myself to learn time remapping because I need it badly for years and Ive always avoided it at the cost of crappy videos. That time over, I must learn it now.